this pin can evolve and the pin chart says to battle. i got it from here http://twewy.wikia.com/wiki/Pin_Evolution_Table
but it didn't evolve and just gave me a star after 10 levels!! why didn't it evolve even though it said to battle!!?

OK, it gets really tricky here. If you had any Shutdown PP or Mingle PP mixed in with your Battle PP, that's probably why.

Evolution is determined by PP dominance. Dominance indicates whether a Pin will evolve or not. Whichever type of PP makes up more than 50% of the total is considered dominant.

However, the game counts SDPP and MPP as NINE TIMES their actual value when determining PP dominance.

For example, let's say a Pin needs 500 PP to evolve, and the dominant type must be BPP. Suppose you get the 500 PP like this:

350 BPP
100 SDPP
50 MPP

Now, the game will count the SDPP and MPP as NINE TIMES their actual value when determining the dominance, thus giving you:

350 BPP
900 SDPP
450 MPP

In this case, SDPP makes up the largest amount, so therefore, it is considered dominant, even though you really acquired more "actual" BPP than SDPP. In this case, your 500 BPP pin will not evolve because the dominant type is SDPP.

For this reason, whenever I have a Pin that needs BPP to evolve, I do ALL BPP as even a tiny bit of SDPP or MPP can mess it up, due to the 9x treatment that it gets.

I should also mention that the SDPP and MPP are not actually getting multiplied by 9. That 9:1 treatment is only for determining PP dominance. If you have a Pin that needs 900 PP to master, it won't work just by getting 100 SDPP. You have to get 900 ACTUAL points of PP.