Give ariados a ability or stat boost that'll make it OU.

Auto Sticky Web ability

Mega Ariados
Ability: Technician
HP 70
Att 140
Def 100
SpA 40
SpD 100
Spe 40

Use it in trick room

>>28114247
Huge Power
Would most likely be UU at best though

Wonder guard

The only one that make him at least viable

>>28114247
HP: 55
Attack: 115
Defense: 50
Sp. Attack: 55
Sp. Defense: 90
Speed: 85

Likewise increase Ledian's Attack stat to 90 and give Ariados access to Swords Dance and/or Technician
252 Atk Technician Ariados Fell Stinger vs. 0 HP / 0- Def Abomasnow: 192-228 (59.8 - 71%) -- guaranteed 2HKO after Stealth Rock
FS is so useless but if a Pokemon gets a specific niche around it, it might be useful. A 30BP Swords Dance would be so nice, if it didnt require you KO something with a move that has 30 base power

>>28114503
Plus a +50 boost in speed

>>28114506
I know right i want fs also to get at least a 20bp increase to make it worth the movespot

>>28114530
Give it and ledian megas with an ability that doubles all its stats if the non-mega of the other one is also on your team, plus the +100 mega bst boost