The team has very little couterplay to crawdaunt, especially since the scizor is not a fast offensive variant, with crawdaunt able to come in and claim kills on most of the team, albeit needing a safe switch in on most of them. It also has some trouble with other strong physical pokmon like terrakion, opposing banded swamperts, SD cobalion (if tentacruel can be chipped) mixed zeraora, which may not necessarily be able to come in on all the pokemon or may have offensive checks, but will be able to claim free kills if they do.
Also if a vincune manages to get up a sub vs the team, it is essentially game over if tentacruel is ever crippled by anything else. In order to rectify these points, a chesnaught would work nicely.
Chesnaught @ Rocky Helmet
Ability: Bulletproof
EVs: 244 HP / 252 Def / 12 SpD
Impish Nature
- Drain Punch
- Spikes
- Synthesis
- Roar
Chesnaught offers to help check and slowly chip away at these physical wallbreakers **, and also helps to add a more reliable scizor answer at same time incase the scizor is offensive knock off or another variant that could hurt the other checks to it on team. It also adds a nice defensive countermeasure to stuff like vincune, and stuff that might want to try and set up on it through roar, and offers some chip damage from hazards too.
Moreover, spikes also help patch up the fact that the only hazard control is by tentacruel, by putting the pressure on the enemy to control the hazards instead of you through hazard stacking, with chesnaught finding many easy opportunities to set up spikes.
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** - While chesnaught still gets 2hkoed by a banded close combat from terrakion, it will chip it largely with rocky helmet if it attempts, and willl take absolutely no damage from any other moves. Drain punch will also be an ohko after a close combat and recover about 40% hp, so chesnaught will be able to beat any terrakion if its given a free swap in, or if its a SD set not carrying fightinium (or if it can be baited).