I created a Bullet Deck with "Ancient" cards.
In the early game, I attack with Koraidon and Roaring Moon.
Especially, Roaring Moon’s "Vengeance Fletching" increases in power as the number of "Ancient" cards in the discard pile grows, allowing you to overcome the high durability of ex Pokémon.
To achieve this, it's important to use Earth Vessel, Ultra Ball, Pokéstop, and Explorer’s Guidance to send as many "Ancient" cards to the discard pile as possible.
Here is the deck code.
Click on "copy" and press INPORT in PTCGL Deck create.
Pokémon: 6
4 Koraidon TEF 119
1 Great Tusk TEF 97
1 Slither Wing PAR 107 PH
1 Radiant Greninja ASR 46
2 Flutter Mane TEF 78
4 Roaring Moon TEF 109 Trainer: 16
1 Boss's Orders PAL 265
1 Awakening Drum TEF 141
4 Earthen Vessel PAR 163
4 Explorer's Guidance TEF 147
2 Counter Catcher PAR 160
1 Lost Vacuum LOR 162
2 Super Rod PAL 276
2 Professor Sada's Vitality PAR 256
3 PokéStop PGO 68
2 Professor Sada's Vitality PAR 170
1 Superior Energy Retrieval PLF 103
4 Pokégear 3.0 SVI 186
2 Ultra Ball BRS 150
2 Pal Pad SVI 182
4 Nest Ball SVI 181
4 Ancient Booster Energy Capsule PAR 159 Energy: 2
2 Basic {F} Energy Energy 6
6 Basic {D} Energy Energy 42 Total Cards: 60 
