TPCi (The Pokemon Company International) has finally released the complete card list for both Mega Brave and Mega Symphonia.
With it comes the last two Mega Evolution Pokemon as well as a few interesting choice tools.
Final Mega Pokemon
Mega Abomasnow ex

Avalanche Hammer: 100x damage. Discard the top 6 cards of your deck. This attack does 100 damage for each basic water energy card you discarded in this way.
Frost Barrier: 200 damage. During your opponent's next turn, this Pokémon takes 30 less damage from attacks (after applying Weakness and Resistance).
Mega Abomasnow ex feels like it has the potential to one-shot even the sturdiest of rivals at a decent speed of activation.
A Stage-1 Mega Evolution partnered with a two-energy activation cost for Avalanche Hammer would make even meta frontrunners green with envy at the speed.
The issue here is how to make Avalanche Hammer’s capability consistent.
Not only is the discard already suspect, but the fact that you need to mill six cards from the deck can easily turn away all but the most creative of players from this kind of self-destructive play style. Sadly, that’s only half the problem.
The other half of Mega Abomasnow ex’s equation is making sure that Avalanche Hammer can hit at least 3-4 basic water energy cards to allow it to one-shot the opposing active Pokemon.
It’s not an impossible task, but something that requires a little more thought on the setup.
As for its Frost Barrier, it appears to be average if not on the slightly lower side of the power scale shown by all the current Mega Evolution Pokemon. At least, that’s how it looks for now.
Baxcalibur with the Super Cold ability could easily allow Mega Abomasnow ex to get Frost Barrier up and running a lot more quickly, so speed is definitely not this Pokemon’s issue.
Frost Barrier’s 200 damage might be on the lower side from what we’ve seen from other Mega Pokemon. That said, having the minus 30 for the reprisal could extend Mega Abomasnow ex’s longevity on the field.
Not to mention that it’s usually these minor damage thresholds that could easily swing the tide of the match for either player.
Mega Manectric ex

Flash Ray: 120 damage. During your opponent's next turn, prevent all damage done to this Pokémon by attacks from Basic Pokémon.
Riot Blaster: 200+ damage. You may discard all Energy attached to this Pokémon. If you do, this attack does 130 more damage.
A surprising Stage-1 Mega Evolution, Mega Manectric ex is basically a hard counter to any deck that solely relies on Basic-Stage ex Pokemon as their active damage dealer (e.g. Raging Bolt ex from Temporal Forces).
As for anything above Basic-Stage, Mega Manectric ex can easily hit for 330 damage if you’re willing to discard all the hard-earned energy you’ve attached to the Mega Pokemon.
While we do have tools like Superior Energy Retrieval available to recover the loss of resources, rebuilding Mega Manectric ex might be a tall order.
That said, this Pokemon does seed the discard pile. If you happen to run Eelektrik from Black Bolt, then you can easily start moving the discarded energy cards back into rotation.
Even Mega Manectric ex’s initial set-up doesn’t sound so bad on paper.
With tools like Miraidon ex to easily bring out your roster, as well as Electric Generator to speed up the curve of any Lightning Pokemon’s attack activation, there are enough ingredients in the card pool to seamlessly integrate Mega Manectric ex into a Lightning-based toolbox deck.
Pokemon Tech Choices
Meganium

Ability: Wild Growth
Each Basic Grass Energy attached to your Pokemon provides two Grass Energy. You can't apply more than 1 Wild Growth Ability at a time.
Solar Beam: 140 damage.
This is probably one of the best tools a Grass-type focused deck could hope to ask for.
By just having this Pokemon on the bench, you can instantly double all the basic Grass-type energy cards you have attached.
This makes Pokemon that scale with the number of energy, like Teal Mask Ogerpon ex from Prismatic Evolutions, infinitely better.
More importantly, it makes those tough to activate attacks like Mega Venusaur ex’s four-energy cost Solar Beam able to activate on the second turn.
The only issue holding Meganium back from being blatantly meta-defining is that it’s locked behind a Stage-2 setup, so there is some investment needed to get the engine going.
Clawitizer

Ability: Reverse and Reload
Once during your turn, when this Pokémon moves from the Active Spot to the Bench, you may use this Ability. Attach up to 2 Basic [W] Energy cards from your hand to this Pokémon.
Aqua Launcher: 210 damage. Discard all Energy from this Pokémon.
A surprising Single-prize Pokemon to come out, Clawitizer feels like the Water-type analogy to Yanmega ex that was revealed in Destined Rivals.
Two hundred and ten damage isn’t anything to sneeze at if Clawitizer comes in while your own active Pokemon is already bloodied from a previous attack or under heavy scrutiny from Munkidoris or the odd Froslass.
This Pokemon might not put Water-type decks back into the meta, but could be another tool for creative Water-type enthusiasts to consider.