What to do with High CP, low IV/bad moves pokemon?

Twister is still annoying to fight on defense, still kinda low cp though.

If you don`t like it then transfer it . I have Arcanine with bite and bulldoze , Gyarados with bite and twister both with over 2k cp I transfer it because i have no use for them

If space isn't an issue, then I'd say just hang onto them - you never know if/when Niantic will do another rebalancing (or implement some sort of feature where you can reroll a pokemon's primary and secondary attacks) and these might become more relevant. I also like having a "living pokedex" of at least 1 of each type of mon in my inventory. That all said, 4 Kinglers seems a touch excessive.

Dont transfer them! I never transfer high cp/iv pokemon cause maybe one day they buff some moves or there base stats like the last update.

Personally I delete the not useful ones. I get mad when I am trying to build up a gym against exeggutor and my magmar has karate chop instead of a fire move. This is partly my fault for not labeling them as such. These kind of things come down to preference though.

Here's what I"m doing - it's a bit subjective sometimes:

For strong Pokemon, high IV's, and a mediocre moveset, I'm keeping either the highest IV or highest CP (depending on if its offensive/defensive focused). So your Gyarados with Twister I would keep. One little tweak and it could be useful.

For mediocre Pokemon with high IV and mediocre moveset I just transfer it.

Using your Pokemon as examples, I'm keeping 0 Kingler. He's just structurally flawed with move typing, he was never that good in the game to begin with, and I have a million Water Pokemon that are better everywhere.

I didn't keep any Hydro Pump Cloyster b/c the whole point of using Ice Pokemon is for Ice movesets. Ice and Water are effective against almost opposite Pokemon (which is why the combo is so good defensively) - might be diff story if you had defensive quick move.

Gengar I'm holding onto the highest IV of each bad moveset, mostly b/c I feel like Ghost hasn't quite come into its own yet. Plenty more Dark/Psychic are coming, and we don't know if Ghost types will ever be tweaked

Pokémon that you catch at high CP's or may even evolve for XP that end up with high CP (Staryu/Krabby and many more) CAN BE VERY USEFUL to have on hand if you are a trainer that frequents gyms. In this case (aka you have the space for these pokémon and you battle often) I have found the pokémon can suddenly be handy when you've run out of potions and revives just a couple hundred from training or taking down a gym. OR, more often I haven't even run out of potions/revives but I am too lazy or want to defeat a gym more quickly so I will immediately re-enter the gym w/my 'B' team of misfits and randoms. Some discretion has to be used here with regards to move set. But I definitely keep high CP, even just relatively decent IV pokémon specifically for gym use.

PS- it can be fun to test your battle abilities with pokémon that either aren't your go to squad or that have crap moves.

I like my little kingler army:) didnt even think about to transfer them.

Twister hits Jolteon pretty hard and once Gyarados starts to spam it it can get quite tricky, because especially Thunder has a long cool down time. The more desired movesets like Dragon Pulse and Hydro Pump are a lot easier to battle against.

I use High CP-Trash for Gym defense in busy areas generally, so it doesn't appear like I'm not trying but it doesn't cost me any revives when they're fainted.

I caught a 2587(?) cp snorlax that was trash. But he had perfect love set for gym defending so I kept him around while I work up my 91% gym defender I hatched