With its first attack, Galvantula ex can melt through Pokmon ex or Pokmon V cards by essentially doubling its damage
As the former is a Game Boy Color title, it can be played with the base subscription
Once you have all the Wildcards you need to craft your deck (every card is crafted 1:1, no need to have 2 or more Wildcards to craft one card) you can head into the deck builder, enable crafting mode and build the deck of your dreams
Some cards have the keyword ability all of the time
They're more useful in this format than most, simply because Commander decks are so large, and each of their 99 cards (excepting basic lands) must be different
If this Pokmon is your Active Pokmon and is damaged by an attack from your opponents Pokmon-GX or Pokmon-EX (even if this Pokmon is Knocked Out), put damage counters on the Attacking Pokmon equal to the damage done to this Pokmon