Where is the odd keystone in pearl?

Where is the odd keystone in pearl?
There are two ways that you can do it:
1.go to hearthome city then go to route 208 that's just at the left on heart home city.
2. go up then down you'll see a black belt ... talk to him he'll say don't talk or something like that then he'll give you the keystone.
another way:
1. go to twinleaf town fly there then you'll end up outside your house you see the big pond go to where the man is then use surf go two steps forward then look at the left and you found the key stone.
That's how you them if you want to know more Pokemon stuff get stuff that are Pokemon OK :p