Level 40, and also, when it evolves Exploud will want to learn Hyper Beam.
Loudred evolves into Exploud at level 40.
Level 40
Level 40.
Loudred evolves into Exploud at level 40+
10000000
40 )
Raise it to Level 20 and it will evolve into Loudred. Then raise it to Level 40 and it will evolve into Exploud.
You can find Loudred in Pokémon Sapphire in Victory Road additionally you can find wild Whismur in Route 106, in the Rusturf Tunnell and in the Victory Road and then you can raise up Whismur until it reaches the level of Level 20 at which point it will evolve into Loudred and another option is to trade with another Pokémon Trainer locally in order to receive Loudred into Pokémon Sapphire.
Whismur evolves into Loudred at level 20.
Whismur will evolve into Loudred at Level 20, and Loudred will evolve into Exploud at level 40
it does not evolve
Loudred will evolve at level 40 or any level beyond 40 (if it's already 40).