The upcoming Battle Partners set for the Pokmon Trading Card Game has revealed many of the Owner's Pokmon cards that will be included when it releases
Infernoid Decatron X FIRE Level 1 [ FiendTunerEffect ] ATK 500 DEF 200 If this card is Normal or Special Summoned: You can send 1 "Infernoid" monster from your Deck to the GY, except "Infernoid Decatron", and if you do, increase this card's Level by the Level of the sent monster, and if you do that, this card's name becomes that monster's original name, and replace this effect with that monster's original effects
Once the mon has three Energy attached and is in the Active Spot, opponents will no longer be able to use Supporter Cards and Gengar ex will be able to dish out 100 damage per turn
Cracking boosters and relying on luck is probably not optimal if you know exactly what you want, so your best bet is to buy singles from online markets like TCGplayer
When it dies, you then exile it and make ten treasure tokens giving you back access to more mana than you paid for it