What mega Pokemons still have value to use in lgpe?

Abilities make a good part of mega mons, e.g. drought from mega charizard Y, mega launcher for mega blastoise, parental bond for mega kangaskhan, and so on. But in lgpe, there are no abilities.So which mega Pokemon have much better use in lgpe, and which mons become very obsolete?

I am looking for a comparison between all of them and a comparison between the first few you get , charizard x y, blastoise, venusaur, against each other and against elite four.

Mewtwo is obviously excluded.

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Ok, this a question about megas, I’m not allowed to fail(Mostly considering LGPE OU)Really GoodMega Aerodactyllosing Tough Claws does not affect it much, as it has nearly unmatched speed and titanic attack.Mega Beedrilreacted similar to Aerodactyl, and it also has the strongest U-turn in the tier, be aware of its frailty and Stealth Rock weakness, though.Mega Gyaradoshas an incredible typing for the tier and overall good stats, but be careful with Zapdos, Electrode, and Jolteon.Mega Alakazamis a terrifying revenge killer, just be aware of the tier’s dark types.Mega Charizard Xis one of the few dragons available, and it can do quite a lot of damage, plus it can viability run special sets thanks to it losing Tough Claws. Be careful with its Stealth Rock weakness.Mega Gengarloss of Shadow Tag really hurts, but it’s still one the best LGPE megas and still banned from OU.GoodMega Charizard Yhas an even worse Stealth Rock weakness than X, but it has a very good wallbreaking potential.DespiteMega Venusaurlosing Thick Fat, it still works well as a tank or even a mixed attacker.Not that badMega Slowbro’s ability wasn’t that useful to begin with, and it has titanic physical bulk, but Mega Gyarados and Starmie are overall better.HurtMega Pinsirlost Aerilate, meaning it can’t hit as hard now.WhileMega Blastoiseisn’t horrible, it losing Mega Launcher severely hurt it.Mega Pidgeotlost No Guard, meaning there is no infinite accuracy Hurricane for it anymore.Really hurtMega Kangaskhanlost its infamous Parental Bond, making it way, way worse.