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Tsuchinoko is discarded, it will simply special summon itself

Blastoise ex is a Double Rare Water type Pokmon card from SV7 - Stellar Crown (030/142)

Considering all the times he makes a point of explaining how he's only "helping" the gang out of selfish reasons, it's pretty clear that it's a shield for his Hidden Heart of Gold

One Trainer in Reversal Mountain that challenges you to a Triple Battle says she's going to name her strategy to attack a single target with all three Pokmon the "Jetstream Attack"

Youthful Valkyrie mostly only sees play in Commander Angel decks, though it does see some niche usage in Pioneer Angel decks