I like the ideas of Crimson Arcanine's Calculating, Espeon~'s Quick Feet and Sanity, Cassino's Last Stand. They look very interesting.
As for mine:
Direction:
Short description: Leads partner to attack next when on 2on2 battles.
Long description: in a double battle, the partner Pokémon will always perform its attack immediately after the Pokémon with this ability does, regardless of Speed. If two Pokémon with Direction are on the same team during a Double Battle, the one with highest Base Speed takes the lead during the duration of the battle. A partner's Extremespeed ignores this effect. This ability does nothing on normal battles.
Shift Chain:
Short description: Forces the opponent to switch Pokémon when the user does.
Long description: if the user of this ability is switched out, the opponent Pokémon is switched too. This ability does not work on Wild Pokémon, if the opponent Trainer has only one Pokémon left, or if the user is in a Double Battle where an ability or move that prevents the opponent from switching out (such as Mean Look) is in effect. It works, however, if the user is forced to switch out by an opponent's move (eg.: Roar).
Crop Scorching:
Short description: increases chance of burn if grass battlefield.
Long description: if the battle takes place "outdoors", in a grass battlefield (be it Trainer or Wild Pokémon), the user's attacks that apply the "Burn" status ailment have a 15% extra chance of doing so.
Easy Targeting:
Short description: increases the chance of hitting larger Pokémon.
Long description: if the Opponent Pokémon is more than twice the size (Pokédex "length") of the user, the user's Accuracy is raised by two levels. In double battles, the ability choses a random opponent Pokémon.
Out of Battle: if a Pokémon with this ability takes the lead, the chance of encountering the most common Pokémon in the area doubles.
Damage Decouple:
Short description: gradually reduces damage from Super-effective moves, at the cost of attacking power.
Long description: each time a Pokémon with this ability is hit by a Super-Effective move, the user's Attack & Sp.Attack drop by one level. As a compensation, the damage taken from the next Super-Effective move is reduced by 25%. The effect stacks three times or until one of the status reaches its lowest capacity, and is reset if the user is withdrawn or faints.
Out of Battle: if a Pokémon with this ability takes the lead, the party Pokémon's damage from status ailments cycle is delayed by one step (meaning it will take place every 5 steps).
I hope you liked them.