Ummm.... Attack them until they are defeated? Maybe bring a few necessary supplies during the fight like Oran Berries and Reviver Seeds?
There are NO Weepenbell bosses.
no there is not a boss and here is something that might help you Pokemon explorers of time, darkness, and sky all do not have bosses.
Bosses (I think) DROWZEE GROUDON LUXRAY MESPRIT GROVYLE DUSKINOR DIALGA THE GUILD FROSSLASS GYARADOS REGIGIGAS DARKRAI
I have only got the grass cornet but the treasure bosses are:mew,kyogre,groudon, and other ledendaries.you can recuit all of them.by Alexander AGED 8
When you complete any random missions after graduating from the guild in Pokemon mystery dungeon, you can go down into the lowest floor of the guild and you will meet team charm, from the special episode. You go with them to Aegis Cave, where you have to gather Unown stones to proceed and fight the bosses Regirock, Regice, Registeel and Regigigas. The bosses only seem to appear the first time you go to the cave, though. From Neonspectre
You Just Get A Gold Box Where It Shows You What Bosses You've Beat
No, there are no further boss battles that actually progresses the story mode. There are extra boss battles, name ly the bosses that you fight for the seven treasures (should still be available via wondermail wific).
beat all of the bosses and get mail?
The Seven Treasurer aren't dungeons but items given to the player after they defeat the bosses in seven secret Wonder Mail dungeons.
Some legendary Pokémon are random dungeon encounters (such as Lugia and Deoxys) that only appear if the Mystery Part and Secret Slab are in the Treasure Bag. Others are bosses of certain dungeons (such as Mew in Mystery Jungle and Giratina in World Abyss). And a few actually challenge your team through personal Wonder Mail S, and join it if you beat them (such as Entei and Jirachi).
Pikachu. It has a high attack, good against bosses (Excluding Skarmory) and it looks pretty cool. The downside is it learns moves S-L-O-W-L-Y. Plus Groundon has a fairly short temper with electric types... If you're in MD Explorers of Time/Darkness or sky, Chimchar always works for me. Just watch out for that Groundon.
The bosses are: Koffing/Zubat, Drowzee, Uxie (Note: You are only battling an illusion Groudon conjured from Uxie), Manetric and his Electrike, Mespirit, Grovyle, Spiritomb, Kabutops and the Omastar Bros, Dusknior and his Sablye, Primal Dialga, The whole Guild, Carnivine, Grimer/Muk, Frostlass, Regierock/Regieice/Regiesteel, Regiegigias and some Hitmonlee/Brongzong, Gyrados, Palkia, Darkrai, The special episode bosses,And the legendaries/ Rare ones ( Exp. Manaphy and Phione).