lucas/dawn little sister at some point will tell you she saw lavitar on news at route 206
level him up to level 30
Larvitar is exclusive to DP. You can either Trade for one, or you can migrate one.
yes just beat the game and go to dawns house and tal to her little sister every day until she tells lavitar and what route to find it on
You can't
you can't
Mt. Silver
safari zone
You need to evolve Lavitar to get a Pupitar at level 30 in Pokemon Diamond. Lavitar can be found on route 207 in the game.
One way you can get lavitar is by trading from Diamond or Platinum or other games or you can also get it by Lucas' sister in Sandgem Town and wait until swarms come it might take a while for it to happen but its possible. Don't worry.
migrate from firered or leafgreen
Yes you can find it at nightime.
safari zone or kanto