You can not find them you can only train them to 50.
First you must have Pokemon Fire Red version in the GBA slot of your DS. Find an Elekid in Valley Windoworks and capture it. MAKE SURE THAT THE ELEKID IS CARRYING AN ELECTRIZER (50% chance in Diamond, 5% in Pearl). Evolve the Elekid into Electabuzz at level 30. Then, equip the Electizer on Electabuzz and trade it to someone you trust. It should evolve into Electivire. Trade it back and you have your pokemon.
Between 40 - 50 or 50 - 60 (:
I'm assuming that your talking about the Unova pokedex. 148 is Thundurus and you can't catch it on Black. You need to trade from Pokemon white.
i dont think you can get a dragonair but i think you can get a dratini (you can get it by trade migration , etc.) Dragonair evolves into dragonite when its lvl 50 <- gasp
Level 50. Don't train traded Pokemon past level 50 or they won't obey you.
level 50
Shelgon evolves at Level 50.
Level 50 Pokemon can be found on islands 5-7.
Yes your pokemonwill drop their stats.
Level 50's and above Pokemon can be found in cerulean cave.
shelgon evolves into salemence @ level 50. try using bulbapedia.com it will answer all of your Pokemon questions.
Wild Pokemon level 50 and higher can be found at seven island and cerulean cave.
stark mountain. its on lvl 70 on pearl and diamond and its on 50 on platinum
Well i find it easy to get a empoleon, magniton, magmar, pikachu, dialga ( palkia, or giritina will do), and a leafeon all above level 50
Mienfoo at level 50. You can find him on victory road
Level 50.
a easier way of leveling up is below! Pokemon level 1-30 find a level 50 Pokemon Pokemon level 31-100 find a level 100 Pokemon Pokemon level 101-200 fight a level 200 Pokemon Pokemon level 201-300 fight a level 300 Pokemon and so on... WARNING YOU MUST DO THIS ON VERY EASY!!