I completed the 16 ep with a mono water team. my team wasnt good, but we got the job done. So i will comment about them and you decide if they are interesing for you
-Bibael/simple : he can sweep teams with rollout, Headbutt ( or aqua jet/quickattack ) and setup moves , amnesia, defence curl, curse or battle itens (X attack, X defense , etc).
-Seaking/Lighting Rod: doesnt the best stats, but can use megahorn, poison jab, bounce, drill run, waterfall , soak, agility ( aka intesing moveset).Also has a eletric imunity. But in goldeen stage is very bad and can be caught later in the game.
-Crawdaunt/Adaptability: With his ablity, he can cause A LOT of water/dark physical damage in one hit, constantly causing 1hitKo... And that is the problem, he is very slow , has poor sp.def/hp and fighting moves are common. If you know how protect/suport him, he will destroy everything. Also he has sword dance.
-Greninja/Protean: he is a ninja
-Seismitoad/Posion Touch: my shiny tank/suport pokemon, has great type (with just a 4x weakness to grass) and good stats. Can easily use rain dance, mudshot/ice wind(slow),infestation or direct damage with ground moves and drain punch. Also, every time the enemy pokemon contact seismitoad, has a chance to get poison.