First, you go to oldale town.Then, go straight to route 103 and last there is May
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You don't need to defeat the Pokemon league to find relicanth in emerald version you can find it anytime underwater near Mossdeep city its very rare to find though so you may have to stay in the grass underwater for a long time.
You may capture a Machop in Fiery Path or Jagged Pass in Pokemon Emerald.
after beating the 4th gym leader may/brandon will come to you and give you the goggels
You find Grimer in the Fiery Path. They are rare is it may seem that they are not there but they are. Its worth the time getting Grimer then evolving it to Muk, because Muk is probably one of the stronger Poison type Pokemon that are in Emerald!
anything that is a ground type. some Pokemon may already have dig like Diglet so you don't have to find the hm.