The only one I can think of is Yanmega (Phantom Forces 4).
Edit:
Oh, and Scizor-EX in the upcoming Breakpoint set.
ok the new umbreon ex that is coming us comong out in the next set does this
Umbreon-EX-darkness-HP-170
Basic Pokemon
(C) 20 damage: discard any number of cards from your hand. Then,draw an equal number of cards from your deck.
(D) (C) (C) End game: 70 damage. IF DAMAGE FROM THIS ATTACK KNOCKS OUT YOUR OPPONENTS ACTIVE MEGA EVOLUTION POKEMON, TAKE 2 ADDITIONAL PRIZE CARDS.
WEAK FIGHTING
RESIST- PSYCHIC -20
Retreat-1
so im trying to look for pokemon that can help Umbreon-EX do more damage with its End Game attack, i know there are pokemon that have an attack that helps Umbreon -Ex do more damage, or helps the opponents active take more damage like the new
Kricketune- grass stage one evolves from Kricktot HP90
(C) Screech: during your next turn, any damage done to the defending pokemon by attacks is increased by 60.
im sure there is a pokemon that says "switch this pokemon with one of your benched pokemon, and during your next turn, that pokemon does 60? more damage. and the attack costs one and does no damge at first. i want to say its a overlooked pokemon maybe grass or fairy.
i had to post the translations cuase that way you know why and what im looking for.
EDIT: I found the card whimisicott -grass-hp90 stage one evolves from cottonee for one colorless fluffly tag: "switch this pokemon with one of your benched pokemon. During your next turn, attacks of that pokemon do 40 more damage to the active pokemon. BCR 15,
now i just need to find other pokemon like kricktunes attqck that makes there active take more damage during the next turn and the effect is on them, so you.can switch to umbreon ex