Gyarados

Learning Guide
Hyper Beam - This is honestly a toughie, because while Hyper Beam is a solid 110 damage white attack after evolution, Gyarados also has access to a 2* purple attack that sends all neighbour Pokemon to the bench with Wait, which is seriously OP. However, it does include your own Pokemon if you don’t have the best positioning, and it is beaten by all gold attacks and higher purple attacks. So I think Gyarados finds its place as a reliable big hitter with Hyper Beam, which in combination with a Manaphy buff or an X Attack, will win most fights for you.

Additional info
Gyarados is a monster, after it evolves. If you use Gyarados without evolving it from magikarp, Gyarados is a 6.5/10 Pokemon, because of its base 1mp, which severely limits its potential. However, because of its ability Speed Booster, Gyarados gains +1mp after evolving in addition to the +10 damage and +1* for its attacks. All things taken into account, Gyarados is the big hitter Manaphy decks have been looking for, and even without Manaphy’s buff, Gyarados is the fresh prince of the ocean, who will move straight into your opponent’s neighbourhood, and tear it up.