It’s happening again. Just like Shining Revelry a couple of months ago, it looks like the next expansion for Pokemon Pocket has been possibly leaked. As always, since this is a leak, it's worth going into this with a healthy dose of skepticism.
The Leak
As usual, this leak has already been circulated on Reddit, after someone reportedly managed to record a video of the trailer for the next Pokemon Pocket expansion. This video was supposedly posted to the Italian Pokemon YouTube Channel.
Unsurprisingly, the leaked video has been taken down already, so it's difficult to determine authenticity. While the leaked video looks accurate, this could technically still be fake.
La Via del Cielo e del Mare:

'The Way of Heaven and Sea' is the translated title of this expansion, if it happens to be true. According to the video, it’s set for release on the 30th of July.
Represented by two of the most iconic legendary bird Pokemon of the franchise, Ho-Oh and Lugia, if this set turns out to be real, it looks like Pokemon from the Johto region of the franchise will be added to the roster.
Additions to the Roster
Ho-Oh and Lugia:

Ho-Oh ex
150 HP
Phoenix Turbo: 80 damage
Take a Fire Energy, a Water Energy, and a Lightning Energy from your Energy Zone, and assign them to your Benched Basic Pokemon in any way you like.
Lugia ex
150HP
Elemental Fury: 180 damage
Remove a Fire Energy, a Water Energy, and a Lightning Energy from this Pokemon.
Thanks to the Reddit community scrutinizing the video, Ho-Oh and Lugia’s abilities have already been translated.
At first glance, Ho-Oh ex is supposed to be the energy acceleration needed for Lugia ex’s more difficult-to-activate attack.
Unfortunately, it looks like Ho-Oh ex also needs that same kind of acceleration, as it needs three energy to activate its attack.
Assuming there’s some truth to this leak, this set has to have something to make these two Pokemon viable.
Shining Revelry’s Charizard ex and Giratina ex are probably the gold standard when it comes to energy acceleration. While Ho-Oh ex can keep pace once online, it needs help.
As for Lugia ex, there’s no denying the power of its attack. 180 damage can knock out anything that's not Venusaur ex. Notably, this legendary bird is held back by the fact that it discards all the accumulated energy.
Unless either Ho-Oh ex can charge Lugia ex twice or there’s something else in this expansion that can help with this issue, it’ll be difficult to see Lugia ex be used outside of anything but a game closer.
On a humorous note, some community members are already thinking about using Ho-Oh ex for Dragonite (ex or otherwise) since the Dragon-type Pokemon needs at least two of the energy types Ho-Oh ex is accelerating.
More Eeveelutions?

Umbreon ex
140 HP
Ability: Shadow Tag
Once during your turn, if this Pokémon is in the active position, you may switch one of your opponent’s damaged benched Pokemon with their active Pokemon.
Espeon ex
140 HP
Ability: Care
Once during your turn, if this Pokemon is in the active position, you may heal 20 damage from one of your Pokemon.
It looks like this set is going to bring in another wave of Eeveelutions. This time it’s Umbreon ex and Espeon ex.
It was during Pokemon’s second generation, when the Johto region was introduced to the franchise, that these two particular Eeveelutions made their debut.
As far as design goes, it looks like these cards are taking a page out of Sylveon ex’s playbook and are mimicking other cards in Pokemon Pocket. Umbreon ex takes after Cyrus while Espeon ex is a Potion.
There are some caveats with their abilities, though. Being in the active zone is one of them. As for specifics, Umbreon ex drew the harsher restriction as it can only target an already damaged benched Pokemon.
(Shiny) Gyarados:

130 HP
Furious Lashing: 20+
You may discard any number of Pokemon from your bench. This attack does 40 more damage for each benched Pokémon you discarded in this way.
Back during the initial run of Pokemon Gold and Silver back in the 2000s, we were introduced to Shiny Pokemon. One that always gets remembered fondly is Gyarados.
Sporting a 130 health, it’s not a bad Stage-1 Pokemon, although it may be a little suspect as a win condition.
On one hand, this Gyarados turns any of your benched Pokemon into literal ammo. At full capacity, you’re looking at 140 damage from a Single-point Pokemon; that’s pretty respectable.
What’s probably this Pokemon’s biggest problem is keeping the damage output consistent. Deck building aside, Pokemon Pocket does have Fishing Net to bring back a Pokemon from the discard pile.
Assuming this design holds true, this Gyarados can also protect prize points as it discards Pokemon already in lethal range of a knock out. This is just speculation on our part, but that would make for some stellar versatility for water decks.
Johto Starters:

This leaked trailer also teased us with the original Johto starter Pokemon of Chikorita, Cyndaquil, and Totodile.
While not shown, this gives us some foreshadowing that their Stage-1 and Stage-2 counterparts could be a part of this set; should this trailer be actually real, that is.
As for their capabilities as cards, they're a good representation of Basic Pokemon; 60 HP and 20 damage for a single energy of their energy type across the board.
Baby Pokemon:

Pichu:
Sparkling Throw
Take an Energy card from your discard pile and attach it to one of your Benched Pokemon.
Cleffa:
Sparkling Call
Take a random Pokemon from your deck and add it to the cards in your hand.
If this leak holds true, we’re looking at Pokemon Pocket’s first foray into using Baby Pokemon.
Sporting a very fragile health of 30 HP and no retreat cost, both of these Pokemon offer some tech choice at the low cost of no energy.
Pichu comes in as a way to recur energy from the discard zone once your initial vanguard has gone down. As for Cleffa, it’s a Pokeball on legs that has RNG slapped on the tin as it targets any Pokemon in the deck
Pichu might be a little bit harder to use, as you’d need to get some energy into the discard zone first to get mileage, but Cleffa can easily be used as a starter. Though Cleffa might run the risk of an early knockout if the opponent is running anything that can potentially hit for 30 on the 1st turn.
Additional Trainer Cards:

Cetra
Choose 1 of your Pokemon, shuffle it and all cards attached to it into your deck.
Argento
Remove a Special Energy card from one of your opponent's Pokemon.
Energy Shoe
If the Pokemon this card is attached to is switched with your Active Pokemon, heal 30 damage from that Pokemon.
Elemental Switch
Move a [Lightning] Energy and a [Fire] Energy from your Pokemon to your Active Pokemon.
Wrapping up this leak, we have a fair amount of new Trainer cards that may be coming in.
Cetra acts as a less restricted but more punishing Ilima. She can bounce a Pokemon on the verge of knockout back into the deck, but you better have a substitute ready to tag in.
Argento translation does spark some interest. If this is accurate, Special Energy cards may also be introduced in this set.
Energy Shoe has some potent healing if you happen to run a deck that likes to shuffle their line-up. Lastly, Elemental Switch may be a sign that Ho-Oh ex may not be the only energy accelerator should this new expansion see actual release.