Can someone tell me how to get bellosom please...and tell me what pokemon..

To get Bellosom is pretty simple, just use a sun stone on Gloom.
If you don't know where sun stone is at I'll tell you. It's at Mossdeed City in the Space Center on the fist floor. Ask the guy nearest to the entrance and he'll give you it.

#110=Spoink(located in route 112)
#111=Grumpig(evolution of Spoink)
#167=Pinsir(located in Safari Zone)(This pokemon is around the grass area where you get Solar Beam)(Mach Bike is needed)
#168=Heracross(located also in the Safari Zone)(Acro bike is needed)
#171=Snorunt(located in Shoal Cave in the ice place where you get Nevermeltice) this pokemon is pretty rare.It evolves to Glalie.

If you want a Bellossom use a sun stone on Gloom.

#110 Spoink - Jagged Pass
#111 Grumpig - Evolves from Spoink at level 32
#167 Pinsir - Safari Zone (NorthWest)
#168 Heracross - Safari Zone (NorthEast)
#171 Snorunt - Shoal Cave (B2F In the small ice room)

I'm fine answering questions.

To get Bellosem get a sun stone and use it on a gloom.

110=spoink=where you beat the magmas/aquas and get the meteorite. The grass thats south from there

111=grumpig=evolve spoink

167=pinser=safari zone

168=heracross=safari zone

171=snorunt=shole cave when the tide is low

Give Sunstone to Gloom. I'm not sure if it needs to grow a level.

110- spoink
111- ?
167- pinsir
168- ?
171- snorunt