Sun Ce's 4th weapon is called Overlord. To get it, go into the Unification of Jian Dong stage. Then defeat Lian Gang to get into the castle. Then chase Liu Xun, ride ahead of him, and defeat the last General at the supply depot.
You can play single player without being connected to the internet. You won't be able to play multiplayer without connecting.
Grove Street is in South Central Los Santos. You can find it near a stadium.
There are a ton of Moga in Monster Galaxy. This page should help you out.
Mt. Silver is probably the best place for you train. The Pokemon there are levels 40-50. You can also rebattle the Elite 4 and the Gym Leaders, and they'll have stronger Pokemon.
Use the Hit Stick to tackle a player by flicking the right stick towards him.
Rookies that you draft aren't real players unless you download an unofficial roster. This means that all drafted players will have a generic face instead of a real picture like current NFL players.
The Move Deleter lives in Canalave City on the east side of town. He lives in the house above the Poke Mart and below the Pokemon Center.