When I am battling on Pokemon-Online I see many Pokemon with alternate forms like,
Iv'e seem more also.I just wan't to know how do I get alternate forms of Pokemon on Pokemon-Online?
To change a Pokemon's form (if possible), click the advanced bar under the pokemon and click side window. On the right, you'll see another bar that says Alternate Forms and you can select the form you want from there.
Just press the Alternate Forms tab on the right side of the Teambuilder. There you can select the form you want.
It's a bit on the right hand side, under the happiness bar.