Feedback Request: Rain Team for Regulating M-B

Before anything, i want to clarify that i already hit master ball with a slightly different version of this team, but now i want to perfect it for the path going forward to champions tier and to use it in a future tournament I'm planning to participate in.

I wanted to invest some speed on M-Mawille so she can outspeed max speed garchomp under tailwind, of course at the cost of losing some attack and hp points, but since she gets a boost with her ability when mege i didn't see a problem. Also, i changed her ability from Hyper cutter to intimidate. Reason being is so she can survive an earthquake from garchomp and provide a counter to physical attackers in general, Hyper cutter was to prevent her being intimidated but i think she will still hit hard when mega. (Haven't tested so i cant know for sure)
Finally the last change i did was to replace sinistcha with volcarona. Because i didn't bring sinistcha to matches that much cause of general bad matchup for him and sometimes he didn't offer much to the game besides the healing and the redirection plus being a grass offer some coverage for switching. Not saying it was bad, but most times i didn't want to open with it because i lost the healing and it's not that good offensive. So I chose Volcarona for his good defensive stats, it also offers redirection and is a second tailwind settler with a good offensive power, given me a fire coverage to deal with annoying mons like kingambit. That way i can open with him plus Mawille, with flame body and rage powder it can deal with physical attackers that treat Mawille and can set tailwind, so i don't need to depend on peli for it.

I would like to hear some feedback, if there are changes i could or should do on the moves, stats, ability or even another mons to use to make the team more solid. Also i want to know any treat i didn't see that can counter the team and overall opinion on the team.