pokemon cards horsea (67/64) - Pokémon Night Wanderer (sv6a) [Electric] x2 Retreat Cost Horsea (Aquapolis 84) - Bulbapedia,

In the early game, when your hand will be loaded full of Dragons as you wont have enough mana to play them yet, this card can deal a lot of damage for only two mana

Malboro has definitely overperformed, and Balamb T-Rexaur has been pretty good too (maybe a tiny bit under expectations)

In fact, it was so popular that Nintendo held a contest

PCC G-Max Smite 150 Your opponent's Active Pokmon is now Confused

Even if you can't steal the game in a few turns, Belle is immensely helpful for generating much-needed resources

This Rayquaza ex promo card was made available back in 2015 as part of the Pokmon TCG Chance campaign running concurrently with the release of the expansion set Emerald Break [XY6]