Water fields probably won't be a big factor until the late part of the game. I mean when else until E13 did we do anything involving (traversable) water?
Honestly none of Heliolisk's abilities are all dependent on Weather. Optimally you would have an abundance of Ability capsules to switch it at will, but that's not exactly practical. Dry Skin would allow it to completely wall water pokemon which (with Amaria likely coming in the next couple episodes I'd guess) would probably be a good idea. Solar Power is like a life orb in the sun only. It would give extra punch, but it wouldn't help it survive very long. It's all dependent on how you want it to work.
I'd go with Dry Skin for now though.
They're really not rare, you can find them on Luvdisc, in mining rocks, with the item finder and in pokeball items. You should be able to come across plenty of them. I'm assuming that Binacle doesn't have it at level 0 and it's a relearn only move?
Good to have you miss. If you have any questions don't hesitate to ask any of us. We'll do our best to accommodate you however we can.
Not much of a roleplayer my self, but there's a specific forum just for Roleplaying, ask Hukuna if you want to know more about that.
Good luck with recovery man. If you ever need someone to talk to during a down day I'm here man. I am in no means trying to blame the victim so don't interpret it as such because the other driver is 110% at fault BUT ALWAYS keep an eye out for stupid people on the road. You have to be aware to all possibilities at all time.
Trust me, you'll find quite a few individuals around here like yourself and we do not tolerate any kind of bigotry, especially in that regard in Reborn. It's nice to meet you. If you have questions don't hesitate to ask.
It really depends what the rest of your current team looks like. But even as you have noted, Reborn more or less is built to make you use more than 6 pokemon the whole game.
Heliolisk, Durant, and Chandelure are all relatively fast pokemon especially in game and not competitively. With Trick Room teams it's best to have 2 members with Trick Room. Scrafty gets Dragon Dance which would probably prove to be more reliable IMO.