Just a few little things I can think of:
-Personally I prefer Giga Drain to Energy Ball on Galvantula, to heal off the damage it might take
-Magnezone should be Modest instead of Timid. It's still too slow even with max Speed EVs and Timid. Modest gives it a little extra firepower. Alternatively you could swap the Air Balloon for a Choice Scarf and keep a Timid nature
-Your team might be a little too dependent on getting the rain up to make use of their Electric STAB via Thunder. Maybe use Thunderbolt or something on a couple of them instead?
-Your Krookodile set looks like a combination of the offensive one and the defensive one. It'd probably be better to use one or the other, because trying to do both at the same time makes it less effective at either task.
Krookodile w/Focus Sash or Life Orb
Nature: Jolly
Ability: Moxie
EVs: 252 Attack, 252 Speed, 4 Sp.Defense
Moves: Earthquake, Stone Edge, Knock Off, Pursuit
or
Krookodile w/Leftovers
Nature: Impish
Ability: Intimidate
EVs: 252 HP, 252 Defense, 4 Attack
Moves: Earthquake, Knock Off, Toxic, Taunt
-I don't think that you really need to have Stealth Rock on Mega Garchomp. Hippo already does that for you and having Fire Fang/Fire Blast gives it more wall-breaking coverage.
I took out stealth rock as its only there if hippowdown fails which doesn't happen often and replaced it with swords dance and I took out rock slide as it seems to not be used as often and replaced that with fire fang to add some coverage. I also swapped out krokodiles evs and ability for the defensive one and it seems to work pretty well.
Heliolisk gained a Normal STAB in Hyper Voice, so it should be using that:
-Volt Switch
-Hyper Voice
-Grass Knot
-Thunderbolt/Hidden Power (Ice)
Nature: Timid
EVs: 252 SAtk/4 SDef/252 Spe
Item: Life Orb
Ability: Dry Skin
Take note that Sand Veil is banned under evasion clause.
A better way to use Mega Garchomp is a Mega Swords Dance set for more firepower behind its physical attacking prowess or a mixed set:
-Swords Dance
-Outrage/Dragon Claw
-Earthquake
-Substitute/Fire Blast
Nature: Jolly
EVs: 4 HP/252 Atk/252 Spe
Item: Garchompite
or
-Draco Meteor
-Earthquake
-Fire Blast
-Substitute
Nature: Naughty
EVs: 16 Atk/240 SAtk/252 Spe
Item: Garchompite
Hippowdon has to use Slack Off as a reliable recovery move; your current set gets worn down without it:
-Stealth Rock
-Earthquake
-Slack Off
-Whirlwind/Rock Slide/Stone Edge
Nature: Impish/Careful
EVs: 252 HP/252 Def/4 SDef or 252 HP/4 Def/252 SDef
Item: Leftovers
I actually used that set with heliolisk before and didn't have any luck id like to sub out grass not though as I never use it and add in hyper voice as I like that a lot. Garchomps sand veil seems to rarely do anything and yes it is banned I wonder why its never been take out rough skin is probably best. As said above I took out both stealth rock and rock slide and put in swords dance and fire fang although I may try a different move if fire fang doesn't seem as useful as I think it is. I don't exactly use hippowdown as a huge staller or attacker plus I find a lot of power in curse that is one of the reasons he is the first one out but I subbed in impish and the evs. other than that I like his current moveset aside from stonedge which I generally
misses so I may sub out rock slide.
from what it looks like, your mono electric is basically a Rain Team without Water-Type majority. i would try to scrap the dependence on rain and go for some of the other abilities those pokemon have access to.
Is Emolga there for possible Double Battles? if so, you should have a pokemon with discharge to capitalize on motor drive. after reading the effect of motor drive, i can see why you would want it, though most would use an ice or rock type move instead of lightning to take it down. of course, you would probably use Emolga to switch into an electric move, but seeing as how your whole team is electric, i doubt anyone would use electric moves anyway. all things considered, the team is well put together, it just seems too dependent on rain. and since weather effects have been nerfed since black and white, i would try to avoid relying on it, unless you have access to Drizzle. (this is coming from a guy who uses a mono fire team with HA Ninetails and Mega-Charizard Y.)
yes I noticed this and I think ill keep rain dance in but lower the amount of dependence I have on it. Emolga is there for a rule I have to follow that needs a pokemon under a certain tier on the team (ikr lol) I onlycme about 2-3 double battles so motor drive doesn't help a ton unless the foe tries to use an electric attack. do you think I should sub out for static? it would likely be very usefull also I need a new move instead of U-turn because I almost never use it nor does it do too much damage :/
thanks for the compliment and as said ill likely take out the dependence on that and put in some thunderbolts and such.