In phase 1, you start with sonic as you know, switch to Silver immediately and keep deflecting the asteroids thrown at you by solaris and firing them back at his arm, one that breaks, switch to Shadow and keep using Charged Chaos Spears until his other arm is broken. You are now left with Sonic to attack the core, I recommend charging before dashing toward Solaris so you have less chance of getting struck by the lazers. Once you take all his health down, a cutscene will occur.
After this cutscene you will be in Phase 2, in this phase you need to use all 3 heroes, in whichever sequence you like, be mindful of rings and in time you will beat Solaris.
I Hope this helps :]
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P. u have to go through the levels, beat bosses.
You have to beat him in a boss fight with Sonic.
Keep jumping on him and dodge his atacks
there are alot of bosses with dr robotnik, and there are a few games called sonic the hedgehog, please specify.
its easy.all you have to do is use silvers force like every other level.but you have to fight iblis.and that's how to beat level one.