OK. Wigglytuff's only real draw over Milotic as a competitive user is probably its typing and higher HP. I won't argue for it.
Manine seems outclassed by Lanturn at first glance due to the latters better typing and movepool, however Mantine has better offensive presence than Lanturn with its slightly higher Special Attack and Speed stats and it has slightly better special bulk of 65/140 rather than 125/76. Its Stealth Rock weakness hurts, but it has 1 set that has any form of competition with Lanturn imo, being its offensive RestTalk set:
RestTalk
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name: RestTalk
move 1: Scald
move 2: Air Slash
move 3: Rest
move 4: Sleep Talk
ability: Water Absorb
item: Leftovers
evs: 164 HP / 252 SpA / 92 Spe
nature: Modest / Calm
The EVs let it sit one speed point above 0 speed Milotic. Maxed out SpA and the rest chucked into HP. A Stealth Rock HP number is not needed due to Leftovers. Water absorb provides more switch-in oppertunities and provides healing on predicted Water-type moves. Modest to boost power, but Calm can be used to boost its special bulk. I think the moves are self explanitory.
While Lanturn does have such a set on the analysis I am writing for it, it is more defensive than this one, which is more offensive.
If it isn't accepted for an analysis, I won't mind. If it is, however, it will be good fun to do.