Beautiful, simply beautiful. This team has speed, power, and high defensive stats in one. But you're missing one thing...
Coverage...
That sceptile could do with some more variation. Maybe some aerial acing move to bust the bug types. I love the harvest exeguttor! But you have a slight issue... Your team has a big hole in it with fire types. You have very few counters for charizard y. It could easily get in the flamethrowers and such on your avalugg, exegguttor, and sceptile without even trying. Your garchomp would hardly be able to counter it in time because you wouldn't be able to set up on a charizard y with swords dance. Charizard ys either carry jolly, or some spatck raising nature, so you're not gonna outspeed very many pokemon like charizard. Kabutops with aqua jet. Simply ingenious. This under used pokemon fit in well. But it has a small issue. Charizard y carries solarbeam, even if you get off the aqua jet, you just won't ohko it. Aqua jets basic battle power is far too low without a bump of attack boost. Sure, your victim I would murder it with that high speed it carries, but I would expect the switch. You need more variation. I'm not hating your team by any means, but just grab some coverage, and use more type variation. A fast jolteon is a must for your team. The electric type is invaluable in the meta game, grab that jolteon! It could save you some time. I'll give you my fc of you wish.