Need help beating Terra

[Luchux]

I've gotten multiple times to her last pokemon, but I just can't seem to beat her. Here's my team:

 

Greninja lvl 74

Ability: Protean.

Substitute, Extrasensory, Night Slash and Water Shuriken.

Gallade lvl 74

Ability: Justified.

Leaf Blade, Shadow Sneak, Close Combat, Psycho cut.

Noivern lvl 74.

Ability: Frisk.

Dragon Pulse, Iron Tail, Super Fang, Boomburst.

Sceptile lvl 74.

Ability: Unburden.

Giga Drain, Dual Chop, Nature Power, X Scissor.

A-Ninetales lvl 74.

Ability: Snow Cloak.

Ice Beam, Dazzling Gleam, Dark Pulse, Hail.

M-Meowstick lvl 74

Ability: Prankster.

Psychic, Light Screen, Fake out, Sucker Punch.

 

I need the help, I've been stuck here for 2 days!!!

[Node15]

Have you tried using X items to set-up and win I know it's a cheeky strategy but it should work granted you do it right.

[Edo]

Hm what about changing Ninetales ability to Snow Warning and replace Hail with Aurora Veil? Just that should help a lot already

[andracass]

her garchomp uses the field really well.

first, the physical/special split change weakens your team pretty significantly- gallade loses some STAB, alolatales loses dark pulse and dazzling gleam, noivern loses boomburst.

the type effectiveness changes also helps it a lot: dragon hits it neutrally, fairy is normal type, and its ice weakness is mitigated by its assault vest, which also gives it infinite draco meteors at full power.

i'd suggest maybe a pokemon with knock off to get rid of its vest (https://www.serebii.net/attackdex-sm/knockoff.shtml)

a little more ice coverage would also do you some good.

i'd also say, in general, that iron tail on noivern basically wastes a moveslot. flamethrower would probably be more useful there (though not necessarily for this fight in particular)

edo's idea is also pretty good. it might also be worth swapping out meowstic if you do that.