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ITT: we give Pokémon new moves or abilities based on their Pokédex descriptions
I'll start:
Jellicent: The fate of the ships and crew that wander into Jellicent's habitat: all sunken, all lost, all vanished.
Abyss
Water type move, 70 BP, special
Brings down the opponent, making it unable to attack or switch and then attacks it the second turn. Doesn't affect Water types and really light Pokémon
Blastoise: The rocket cannons on its shell fire jets of water capable of punching holes through thick steel.
Jet Pulse
Water type move, 70 BP, special
The user fires a powerful jet of water that is super effective against Steel types. Boosted by Mega Launcher.