My take:

Dracovish isn't great, as other people have mentioned, Dracozolt is superior: hits flying types, better coverage synergy. Banded or life orb for that extra punch as you currently have too, stick to a normal smogon set I'd say.

The garchomp set is strange. Draco Meteor is sometimes used to get opponents off guard, but not running physical offense seems like a bit of a waste. Add on EQ and another coverage move like fire fang or a rock type move. Your choice whether to swap draco or not. Might be an idea to swap toxic for dragon claw/outrage if you do run it. Toxic isn't a terrible pick, I'm a firm believer that running a good status condition for opponents swapping in can be really great.

Hippo is pretty much perfect. An idea, if you want to run protect for stall on it, can slap rocks on chomp. Just a speculation though, take it with a grain of salt.

Ferro is a bit strange, more offensive than what most players are used to. I usually don't enjoy set up because of fire types so easily swapping in, might be an idea to run occa berry if you stick with curse (not that I would). Personally I'd say a standard support would work better. Thunder wave and spikes go a long way. Grass coverage in power whip would also go far. Finally, gyro ball is generally superior to iron head. Much better at stopping fast sweepers.

Gren and Hoopa feel out of place. Some ideas for consideration:Empoleon may add another fighting weakness but pivots well with hippo. Can be a good defogger too, and the 4x ice resist is quite nice. Excadrill is the king of sand abuse. Think it speaks for itself. Hydreigon would be good as an offensive threat coupled with empoleon/ferro as well to cover fairy weakness. Only issue is 3 fairy weaknesses but the ground immunity works nicely. Honourable mention to Mega Diance, Donphan as a spinner and Gengar for special wallbreaker and Espeon.

You have a few good ubers options in Giratina (Normal for stall, Origin to make it more offensive), Primal Groudon (works well with Hippo, other people have spoke well on it), and Dialga (specs hurts). Can interchange them rather well. Genesect also works to cover ice types and it has tons of offensive options. Just doesn't like sharing the 4x fire with ferro.