Just punch Garp, Garp responds well to actions and strength. Garp doesn't care enough to listen to some fake made up statement. Just say you want to be trained and then prove yourself.
This chapter is a very good job, and Mc forgot that people at the vice admiral or admiral level have haki (maybe in our case here haki observations), he cannot lie to them or fool them with just a fake smile đ lol
Can I have hope of the MC becoming more genuine instead of staying ever dead serious with his act? It makes it kinda hard to feel for him when all he ever does is acting