So I watched this as a kid, best guess was around the early 2000’s. It was dubbed in Cantonese so the actual show might be older.
The show follows a couple of kids and some professor type character. They play this game where they are booted into a virtual world, similar to the way Matrix works, and they pilot these robots/mech suits and fight. I remember that the kids end up getting hurt in the real world if they take a lot of damage in the virtual world. If memory serves me right, they enter the world in an observatory/ radar looking building in a canyon/ mountain environment. I think towards the end of the show, the virtual world somehow clashes with the real world so they have to fight to save reality or something.
Specific details I remember are:
The main guy, black hair kid rides a skateboard. Maybe it was a hover board? (It’s not Eureka 7) I think he accidentally stumbles into the group that plays the game. I think his robot was white and red. I think the 1st episode of the show started with him jumping through the turnstyle in a subway and escapes with his board from security. He ends up booting a hoverboard for his robot in the last battle.
Another main guy, blonde kid. He pilots a green robot and is like the pro of the game.
Then a girl, I think she has pink hair. Her robot was all red (I think) She admires the gameplay of the blonde kid but doesn’t know what he looks like. I think she was shocked when they finally meet each other.
I hope these details will help identify the show. It’s really been bugging me in the back of my mind.