I understand the distress of the Mawilite ban for Fairy teams, but you will have to adapt and change the standard team style of "set screens and spam sucker" with Fairy teams, as it was honestly getting overwhelming for most teams, and took little to no effort in doing so. This will now force different antics and I hope to see Mega Diancie in action, with its massive offensive powers and nice physical rock STAB. It's too early to draw conclusions yet, as the bans are not even live on the server yet, so until then, we need to wait and see how it pans out for Fairy. Just as a side note and confidence booster, one of the highest ranked fairy users on the ladder does not even use Mega Mawile, so don't think losing that means Fairy is now trash, because it definitely is not.
Anyway, I want to talk about Galladite in this post. Mega Gallade is probably even worse than Mega Medicham, due to its bulk and dirty Bulk Up Drain Punch sets that some carry. This is totally devastating to every normal team and most steel teams. Some run just an offensive SD variant, which is probably more destructive. Mega Gallade, just like Mega Mawile, needs to set one SD and the pressure is on. Unless you have a physical scarfer (assuming it is at full health and can survive a +2 shadow sneak), most will fall to a +2 CC or Drain Punch. Taking a look on how teams manage against Mega Gallade:
normal - will get dominated, even with mega arduino.
fire - can apply great offensive pressure, and runs nice scarf users, so probably neutral.
water - can hope for scald burns, but if on psychic teams, the burn will be healed. other than that, the offensive pressure gets too much for water. slowbro gets deck'd by knock off
electric - deck'd. can have rotom-w as a check assuming its at full health, lanturn with twave, but again, if these mons arent at full health, its over. fighting will never allow that and psychic can stall it out.
grass - can hope for skymin hax. not good enough reasoning though
ice - can apply heavy damage with kyurem-w draco or ice punch weavile. but drain punch will give back a lot of hp. so ice will struggle heavily.
fighting - neutral.
poison - if(psycho cut) { deck'd; }
ground - hippo can check for so long, and sand rush excadrill can hope for iron head flinches or ko with earthquake if gallade is damaged. would be a bit of a struggle
flying - skarmory can hold it off until it sd's and ruins everything with ice punch. zard mega x can be bulky and WoW but if its +2, don't think it'd survive.
psychic - whoever +2's with gallade first and shadow sneak/knock off spams.
bug - mega pinsir is tanned but its outsped, so need to make sure mega gallade is weakened before quick attacking. probably neutral matchup
rock - rof
ghost - knock off spam, sneak spam, though aegislash and mega sableye can probably hold its own and support the team well.
dragon - offensive usually, so classic outrage spam would probably be fine, but its a poor playstyle in other scenarios.
dark - reliant on mega sableye and greninja to hold off and revenge kill respectively. not good enough as mega gallade can sub/sd/bulk up
steel - overwhelming pressure. if skarmory is gone, gonna have a hard time.
fairy - clefable is a great wall, as is prankster klefki t-wave to cripple it. fairy could hold its own i believe
Just a quick analysis on how teams match against this powerful mega in my opinion and experiences, so share your thoughts on that for the community to read and think about. Having said all of that, I am supportive of a global ban for Galladite, though I want to hear what the community has to say. Also, please note anyone can talk and vent their thoughts here. You don't need an invitation to post here, as someone above implied.