Congrats to the OP. I assume he's at the act 5 level, so yeah...I (grudgingly) concur with those dudes above saying you should upgrade *insert robo-dude* first. A rank 4 4* g99 is already OP enough for act 5, while *insert robo-dude* needs as much upgrade as he can get to up his damage.
But it should be g99 straight after, especially for when you get on 5.3. A rank 5 4* g99 can solo the entirety of 5.3 as long as you know what you're doing.
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But it should be g99 straight after, especially for when you get on 5.3. A rank 5 4* g99 can solo the entirety of 5.3 as long as you know what you're doing.