just dont get grabbed deo. If you get CG, mash out as best you can. When he sends you off stage have a game plan rdy for how you use your second jump. Save it untill you rly need to use it. If possible try to recover as high as you can. Wall cling can be a godsend. Just make sure you dont cling for too long else you'll get bair'ed off.
Other than that, stay air borne. Spam AS, and when you get inside, jab, utilt, grab into a combo then get out and spam AS/Fair. Make sure fairs are well spaced. Use Fsmash wisely and do not be predictable with it. Also do not dair on a DDDs shield unless you wanna get utilt or grabbed.