Night March has some potential. The idea is to get a lot of pokemon in your discard then start Night Marching. The damage really starts to add up. Battle Compressor really helps with that setup. Your main attacker is Gourgeist who can use Night March when a Celebi EX is on the bench. Gourgeist also has a massive 200 HP when it has a grass energy attached (Grass energies are played instead of Psychic). Dimensional Valley can let you use Night March for only a DCE. The damage really stacks up. Seismitoad EX isn't as big of a problem as it might seem because you can just harass it to death with Celebi EX (or Virizion EX).
Gourgeist - Psychic - HP100
Stage 1 - Evolves from Pumpkaboo
Ability: Big Pumkin
Whenever this Pokemon has a [G] Energy attached to it, this Pokemon's maximum HP is 200.
[P][C][C] Horror Note: 10x damage. Does 10 damage times the number of cards in your hand.
Weakness: Darkness (x2)
Resistance: Fighting (-20)
Retreat: 3
Pumpkaboo - Psychic - HP60
Basic Pokemon
[P] Clash: 10 damage.
[C][C][C] Night March: 20x damage. This attack does 20 damage for each Pokemon that has a Night March attack in your discard pile.
Weakness: Darkness (x2)
Resistance: Fighting (-20)
Retreat: 2
Lampent - Psychic - HP80
Stage 1 - Evolves from Litwick
[P] Cursed Drops: Place 3 damage counters on your opponent’s Pokemon in any way you like.
[P][C][C] Night March: 20x damage. This attack does 20 damage for each Pokemon that has a Night March attack in your discard pile.
Weakness: Darkness (x2)
Resistance: Fighting (-20)
Retreat: 2
Joltik - Lightning - HP30
Basic Pokemon
[L] Gnaw: 10 damage.
[C][C] Night March: 20x damage. This attack does 20 damage for each Pokemon that has a Night March attack in your discard pile.
Weakness: Fighting (x2)
Resistance: Metal (-20)
Retreat: 1
Battle Compressor - Trainer
Item (Team Flare Gear)
Search your deck for up to 3 cards and discard them. Shuffle your deck afterward.
You may play as many Item cards as you like during your turn (before your attack).