From: RPG Eater | #004 Isn't Water Absorb better anyway...?
Burn, paralysis, freeze, poison, and sleep aren't something Vaporeon is comfortable with receiving so it having the ability to rid itself of said elements can make it much more self-reliant. With WIsh/Protect + Leftovers + Hydration, Vaporeon could become a beast that would be frustrating to say the least.
you won't be able to run wish alongside Hydration unless the new Vaporeon already has that in it's moveset (does it?) However, with Rest it will be insta-healing to full HP in the rain every turn it needs to.
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