The Volbeat example is inaccurate since IIRC Volbeat gets Tail Glow by level...
I meant the move "GROWTH", since Illumise cannot get both Baton Pass and Growth. Either way, it gives
Growth and Baton Pass to a Mischievous Heart User which is +2 Atk, +2 SpA under Sun.
This means you can breed a Voltbeat (3/4 Gen Voltbeat-
Baton Pass, Encore,
Trick, Growth [Mimic Glitch] with 5th Gen. Illuminise DW-
Mischievous Heart) to produce:
A.
Volbeat
Ability: Mischievous Heart
-Baton Pass
-Encore
-Trick/
Double-Team/Substitute/Psych Up/Light Screen
-Tail Glow (Grow baby Volbeat to level 21 in B/W)
or
B.
Illuminise
Ability: Mischievous Heart
-Baton Pass
-Encore
-
Growth
-Double-Team/Substitute/Psych Up/Light Screen
This way Illuminise can get both (EGG) moves from Volbeat (Baton Pass, Growth) that would otherwise be illegal to have at the same time, and since you want Mischievous Heart too, ya can't just Mimic Glitch Illumise, you gotta breed for it.
What Ice Beam said, BUT...
You could throw MORE onto it to be passed now. Minimize/Cosmic Power, maybe?
Remember only Egg moves can be passed down from the father (Volbeat) to the baby, and the baby can only get TM/Level Up moves from B/W since it can't be traded back to 3rd or 4th gen due to DW abilities like Mischievous Heart not being compatible.
It might be useful to keep in mind other examples of Pokemon whom want DW Abilities, or 5th Gen. Pokemon in general whom have illegal Egg move Combinations that can now be remedied from a FATHER possessing all Egg moves on 1 moveset Gen using the Mimic Glitch.