Question

What are the swarms in Route 5, 4 and 8 in B/W?

Comments

What game? B/W I assume?

Answer 1

5-smeargle
4-Hippopotas
8-Croagunk

http://www.serebii.net/blackwhite/swarms.shtml

Answer 2

Someone else already asked a question similar to this but...

Route 5- Smeargle

Route 4- Hippopotas

Route 8- Croagunk

This is the similar question I was talking about:

http://pokemondb.net/pokebase/81178/how-long-swarms-last-what-pokemon-appear-for-what-routes-swarm

This person asked for all Pokemon so you won't need to look for / ask for answers again.