3rd Gen Berry Crush

I have some different berries in my bag such as Razz Berry and Bluk Berry.

The only point to these kinds of berries are only to grind up into powder as an ingredient for medicine through the mini game Berry Crush in the Union Room, right? I am re-playing Leaf Green on a DS Lite and don't have any wireless/multiplayer features available. So I might as well sell them for money right?

The Razz and Bluk berries are some of those kinds that don't have an effect outside of the Berry Crush. You'll be fine selling those, along with any Nanab, Wepear, and Pinap berries.