#HBC | Laundry
Grand Sage of Swag
Apparently you've never played against Shadow Tag Chanderp then. This is that on steroids.Mega-Gengar is going to suck.
If a pokemon ability said "Get a free Mean Look when you attack" it would be a bad ability.
Losing levitate is a huge deal, though having it on switching in is nice.
If you switch it in, sub, then switch out just to gain Shadow-tag, either you're opponent is really bad to allow you to waste that much time and not gain some sort of advantage, or you are losing tempo.
Its exciting when you first hear it, but when you look what it means in game and when you compare it to the likes of Mega-Garchomp you can certainly see the huge drawback. I'd rather just use Normal Gengar.
Like, your entire argument is that "Oh he doesn't get an item and they'll switch, radarada". Okay, so they switch on your Shadow Tag. Unless it's like TTar, Scizor, or the rare Weavile, you have absolutely nothing to fear by switching out. Suddenly, your Gengar is now a 130 base speed Shadow Tag user that can revenge kill anything at will and you're willing to use Chandelure, something that has to run Choice Scarf just to match Gengar's capabilities, over it? Just because of the chance that they switch out when you're not forced to Mega Evolve in the first place?
Hell, Mega-Garchomp isn't even that likely to be good. Getting Sand Force means jack in a meta where TTar sacrifices a lot by holding a Smooth Rock (sacrifices the power of choice items, the sustainability of lefties, or the usefulness of a Chople Berry).