Elec's check:
 in usage tips, don't say that hypnosis just cripples the foe, mention how it puts them to sleep, rendering them helpless.
Unnecessary

Wording in entire analysis (especially Overview) is awkward, looks like bullets were simply written down but without bullets. Not really connected. Preferably fix this before GP.

Moves:
Make clear why hitting Pump and Frillish with Thief is important (wall Poli completely)

Set Details:
Offensive investment before defensive investment (0 HP EVs give Poliwag an even numbered stat as well, you only invest into it cause you have stuff leftover)
Water Absorb lets you avoid Scald burns meaning you set up on certain Water-types (like Staryu with no TBolt)

Usage Tips:
Even switching into Water-type moves is risky because mispredictions can cost you a lot and most Water-types have coverage to hit Poli with. Make this clear
Examples of revenge killers to eliminate