can someone tell me exactly how the pokeradar works? I cant figure it out for the life of me
It's kinda complicated if you get into chaining and that kind of stuff, but it's relatively simple for finding just one Pokemon. First, if it's not charged, you have to walk around for 50 steps to charge it. Then, you walk into any grass patch and use it (as long as you're not on your bike). Now, sometimes you'll get unlucky and it'll say "The grassy patch remained quiet" or something to that extent, and if that happens, then just run around and try again once it's recharged. If you're not unlucky, some grass patches will shake. If it shines yellow, that means it's a "rare" Pokemon on that route, or a Pokeradar exclusive Pokemon in there. If it shakes and stays green, it's just a normal Pokemon. If it shines whitish, then it's a shiny Pokemon in the grass.
Chaining is where it gets complex. First, you have to start a chain by running into the Pokemon you want using it. Once you've done that, then either catch it, or knock it out. After this, the Pokeradar will show new grass patches that you can run into and find a Pokemon. However, you can still find Pokemon in the grass normally, so if you're making a chain, it's highly recommended that you use a Repel. Your chain will keep going as long as you keep running into the same species of Pokemon, don't step out of the grass patch, and don't run into the "corner" spots of the grass. There's a video on Youtube that explains it better than I do.
EDIT:
Q: My friend want to know which would more helpful to Starmie, Rapid Spin or Recover? The others move on this Starmie is Psychic,Ice Beam, and Thunderbolt. Since she doesn't have a set team where this pokemon if going to be I'n not sure what to tell her.
If she ends up having a major Stealth Rock weakness, and no other Pokemon to Rapid Spin, that would be better. If there's no Wish support or anything like that, then Recover might be better. Personally, I think Specs Starmie with Grass Knot over either of those is better.