Team suggestions for pre-post game

[laggless01]

I'm doing a second run to get a different ending, but wanted to avoid some of the messy situations I got myself in last time. For this, I am hoping to have a team with Lycanrock-dusk (mystery egg, Z-move terrain removal, can run SR for utility) and Klefki (screens, spikes + typing, plus I got a shiny). Greninja is likely to be part as well for complementing overall coverage at the end, as I picked one as a starter (suprisingly underwhelming mid-game due to weak attacks) and it being a very fun mon to have.

The problem is how to fill up the rest to handle the new E19-content before post-game.

Spoiler

For Underwater Field I am considering Poisonium-Z on Greninja to undo the field as they won't get the speed issue before it, but better alternatives are welcome.

As stated, the Lycanrock is for terrain removal, so I can avoid dealing in particular with New World, hence Klefki to give it an opening to launch the Z-move and undercutting field-based strategies. Faster leads like Noivern would be an issue though, so handling those would be nice. I am worried about Elias' ES Dragonite as well

Lin has two nasty teams, one with a PULSE-Abra I only beat last time due to Fire Chicken cheese, and the other because I only had a Wall Aegislash left that luckily countered the PULSE-Arceus. Given that neither might make the team due to synergy and personal preference, I'm a bit at a loss on how to handle those this time.

Currently I do have a decent pool of mons already trained namely: Amoonguss (Calm), Weavile, Mantine, Meowstic-M, Diggersbytho, Excadrill, Toxapex (Bold), Cofagrigus (Bold), Alakazam, Ribombee, Medicham, Gliscor, Venomoth, Magnezone, Tyrantrum, Infernape and (shiny) Lucario.

Although I have a bunch of mons that could fill nice team roles, I struggle with actual synergy between them as well as knowing some fights will undo their ability to perform their role as well.

 

Particularly useful sets (besides the obvious) for existing ones, as well as new mons, and tips for team building in this case would be appreciated.