You don't use any specific Pokemon. You must have the enigma stone. You could have gotten the stone from a long ago event, which has since passed. With the enigma stone, you take it to Steven to be evaluated in a museum for fossil resurrection. Walk outside to battle latios.
One of the roaming Pokemon ex. Raikou, Entei, Latios, Latias
Hmmm.....that's tough I suggest Latios or Rayquaza but it's honestly up to you
You have to have a specific Pokemon like gengar or snorlax just use block or mean look . Hope this helps .
No, as you can not legally obtain a Soul Dew on Pokemon Black/White
In Pokemon SoulSilver, only Latios is available. To get a Latias, you need an Enigma Stone, which is an event item. You can also trade with someone, use a cheat, use an action replay, etc. Hope I helped :)
use the pokegear
Yes
latious
You don't you have to use an Hm on a Pokemon
eevee
you get heracross or combees when you headbutt a tree
Use the Pokemon modifier AR code