SO! First, I assume you play on normal. If it were hard mode, you probably wouldn’t have made it that far. Let’s begin.
I suggest switching Delta Muk for Excadrill. First, it is a BEAST. Under sandstorm, it helps a lot against some of Eduard’s team, counter Yuki except for Rotom under sandstorm and destroys London if Trick Room isn’t up. Moreover, it tears appart most of the champion’s team. It like Tyranitar’s Sand Stream.
Excadrill @ Life Orb/Leftovers
Ability: Sand Rush
EVs: 252 Atk / 4 Def / 252 Spe
Don’t use synthesis if you have Tyranitar in your team. I suggest this set for D.Snorlax:
Delta Snorlax @ Leftovers
Ability: Thick Fat
EVs: 188 HP / 144 Def / 176 SpD
it is the Standard CurseLax set, but adapted to D.Snorlax.
There is something I always says to people who have difficulty against Elite 4: TAUNT! Taunt completely shuts down Kyla and if the Taunt user has ground immune, he also shuts down Eduard’s lead too! Great one is Gengar.
TGengar @ Life Orb
EVs: 252 SpA / 4 SpD / 252 Spe
IVs: 29 HP
29 Hp IV optimise its HP loss by the Life Orb, but isn’t necessary by all means.
Gengar @ Black Sludge
EVs: 8 HP / 248 SpA / 252 Spe
Other notables include regular Gardevoir with Trace, Gyarados and probably your Ferraligatr too.
Talking about it, Ferraligatr is a awesome Dragon Dancer. However, it is an an egg move. Or, he can also use Swords Dance if you don’t want to breed. This is sub-optimal though. Use Waterfall, Ice Punch, Superpower and Dragon Dance/Swords Dance. He MUST be your mega evolution.
Delta Gardevoir, I like her as a Choice Scarf User. With Thunderbolt, Ice Beam, Moonblast and Earth Power, she actually hits a huge portion of the game for supper effective damage, including ANY dragon type. It also outspeed any unboosted dragon.
If you use 252 Hp/252 Spe Giratina, use Hex because of his offensive capabilities. Toxic would be better as for damage output. With this set, a Toxic Spikes user is greatly appreciated.