Depends on which game(s) you have.
snubbull
you have to get beldum and when it is a lvl 21 it evolves into metang. there will be a beldum swarm somewhere after the national dex. P.S metang evolves in to metagross at lvl 40
You must talk to dawns little sister at her house in sandgem town and each day will be a Pokemon swarm ( random upstart of Pokemon for that day ) one of the days dawn will say there is beldum swarm on near the sandstorm route.
In Ruby and Sapphire, Beldum is found in Mossdeep City after you beat the Champion, Steven. Its in a Pokeball in Steven's house as a congratulation. Pick up the Pokeball from Stevens table and VOILA! You have a Lv 5 Beldum!
you don't find a beldum in Pokemon ruby. you can get one in Stevens house where the 7 gym leader is. its in the top left house. you find a pokeball and it has a letter from Steven. BTW i think you should finish the pokempn league before you go to his house.
you can't find metang in Pokemon diamond you have to get beldum in swarm when you get the national pokedex and then evolve it
Go to dawn/lucuses house and talk to her little sister... she MIGHT say there is a swarm on route 228......
none do but you can catch him by swarm on rout 288
He is a swarm Pokemon. Talk to Dawn, Lucas's little sister in Sandgem town; she will say there are lots of Beldums swarming around a certain route; go to that route and search for Beldum. He is hard to find.
Go to dawn/lucuses house and talk to her little sister... she MIGHT say there is a swarm on route 228......
You Can't. You can catch a Beldum in a swarm after you beat the league or migrate it but there are no other ways to get it other than that without cheating.
snubbull
Go to dawn/lucuses house and talk to her little sister... she MIGHT say there is a swarm on route 228......
A Pokemon Swarm is basically a Pokemon that is swarming in a certain area say a bledum is swarming the beldum has a higher apperance rate
you have to get beldum and when it is a lvl 21 it evolves into metang. there will be a beldum swarm somewhere after the national dex. P.S metang evolves in to metagross at lvl 40
beldum swinub eletrike skitty lotad nosepass smoochum
you will find beldum in the cave