ive came to the cener of the galaxy with out the trainer only using energy and health packs
And what exactly does this have to do with anything in this topic?
On topic, it's entirely possible to befriend them...however, as has been posted:
1) Everyone else WILL hate you
2) If you EVER go to war with them, you will NEVER be able to befriend them (Daunting task, I know, but it can be done)
3) There are FAR more races in Spore (the more you download, the more you'll meet) than there are Grox...meaning you'll really gimp yourself if you befriend them.
What's also possible, but seemingly IMpossible, is claiming every non-grox planet IN THE GAME as your own Strangely enough, this is easier than befriending the Grox...