1. Talk to girl at Dawn's house in sandgem town and she might say "What did the news on TV say? ...... On route 228 there's a bunch of beldum there ???????? you have to hurry i want you to do better than my sister Dawn. 2. Then go to route 228 and look in the grass fields and then you will see a beldum
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you can catch beldum at route 228 with poke'radar
you need to catch a beldum on route 228 and get it to level 20 to evolve it into metang then level it up to level 45 to get a metacross
In Pokémon Diamond/Pearl/Platinum there is a swarm in Route 228 that you can find wild Beldum. Be prepared, Beldum, along with its evolved forms, are the only non-legendary Pokémon to have a catch rate of 3, which is the lowest possible, making Beldum extremely difficult to capture due to its self-damaging move, Take Down.
if you talk to dawns sister she will tell you were you can find a Pokemon she will say there is a beldum on some route you can only talk to her once a day
Talk to Dawn's/Lucas's little sister (in sandgem Town) once eveyday and eventually she will say there was a "mass outbreak" on the news of beldem on route 228.