Why do I only get Audino when searching for Deoxys with a lv 69 as my lead?
That might be because you're not looking at the right place...?
Deoxys is outside the Giant Chasm, but not in shaking spots. It's in the double grass.
Alright, so I made some experiments, about what happens when a regular White version interacts with a Volt White version. This might interest you.
Battles : It's totally possible to battle. The edits are client side, which means a Serperior will be Grass type in White, and Grass/Dragon type in Volt White. Same thing for moves : Cut is normal type in White, and grass type in Volt White. Which means that if something happens in the battle, that doesn't have the same effect on both games (like, let's say Serperior takes a Dragonbreath in the face), one of the two games will crash.
So, it's possible to battle, but ONLY with Pokémon who don't have a new typing, and untouched moves. I don't recommend it though, because with the moves, abilities and stats in BB/VW, it's not fair to battle someone with B/W. BB/VW battles should be fine however.
Trades : They work perfectly. If you trade the Serperior from your VW to your White version, it'll lose its Grass/Dragon typing, but the ability stays the same. If the stats are edited, they'll stay the same through the trade (tried that with a Vanilluxe), but if you put that Pokémon into your PC, it'll have normal stats.
To put it simple, when you trade a Pokémon, if the typing is different then it'll be corrected, but the ability and stats stay the same. The stats are recalculated if you put your Pokémon into the PC. And, obviously, these Pokémon are hacked.