Blaziken to rise to B+:
Abstain; I've never used it and I would have to see it in practice in order to be convinced, but it seems too niche on the surface
Mega Blaziken to rise to B:
No; Waste of a Mega slot
Escavalier to rise to B+:
Yes; I nommed this
Mega Sceptile to drop to B:
Yes; I also nommed this
Salamence to drop to B
-:
No; It has a fantastic movepool, Intimidate, and can fulfill multiple roles on a team very well
Mega Charizard X to rise to B:
Yes; Great set-up sweeper, and I could see it being successful since 99% of users are expecting Char-Y
Mega Venusaur to rise to B:
Yes; Fantastic wall and win condition, and severely underrated imo
Mega Sableye to rise to B-:
No; I think it's fine where it is, plus using Mega Sableye is really tricky to use effectively due to it requiring set-up and having meh Defenses. It also needs to be cautious of mega evolving since Prankster is such a valuable ability
Raikou to rise to B:
Yes; Fantastic on rain teams, and a cool alternative to Thundurus (cause face it we're all sick of using that thing)
Mew to rise to B+:
Abstain; I would need to see a replay of this thing being used effectively WITHOUT Transform in order to be convinced
(side note:
xzern, Mega Sceptile is already in B and is moving down to B-, just a little error that everyone is making. Also you spelled Escavalier wrong lol)