Strengthening Devil Fruit powers

Bheema_Reddy said:
Just started the Marineford arc. Got this doubt, How does one get better at their devil fruit powers? Whitebeard caused a Tsunami, Aokiji was able to stop that tsunami. Blackbeard is able to do baffling things with his powers. Does this mean that the powers they got were so OP, or their user trained and became OP? If so,what would that entail?
(Naruto includes training to increase tbeir chakra output and learning new jutsus. In Bleach,you need to train your mind and body to handle new speeds and power levels,what is it in One Piece?)

l1ght__ said:
It’s not always that a DF overpowers another. It all depends on how it’s used. DF users don’t suddenly start using moves, they train, again and again and get better at it. They also use their creativity and wit, had Ace not given a shit about what Akainu said, he would have easily survived, but that guy just asked for it.Read on and you’ll see why Luffy is so strong. Gear 2 and 3 are perfect examples of creative uses of Devil Fruit. At the beginning, Luffy was just throwing rubber punches but now that guy can inflate his whole ass hand and what not.

Sensei_1 said:
The devil fruit abilities are just curses on your body, how you use them is completely up to how the fruit affected your body, the nature of the fruit and your use of whatever you got. So yes some fruits are just more over powered that the others. Devil fruit can get "stronger" but that is something you will not see any time soon. But most times it's just that a person is better at using their own fruit or a fruit is just more powerful than another.

Think of a devil fruit like a zanpakto instead of reiatsu and Reiryoku(bleach main power system) every sword is different comes with its own unique abilities.

Also you are at marineford so I'm sure you've heard the word "haki" being thrown around. Keep and eye out for that it will be fleshed out soon.