Josh spent 3 years of his life on that uninhabited island and trained his butt off.

There were times when he wanted nothing but to get off the damned island that, he decided to name 'the island of Isolation' due to its lack of people.

There are wild beasts on the island that he could kill and eat, so there was no worries for food and training went as smoothly as possible.

In the first year, he focused on his devil fruit powers and his physical strength and body.

He had to find out everything by himself for his devil fruit in order to use them. He also had to be careful of seawater or he would drown and die, since there was nobody to save him on the island.

The training for his devil fruits went pretty well. He could turn to lightning whenever he wanted. In fact, he made sure that he was lightning all the time. Josh also copied some of the moves that he remembers Enel using and created many more original moves for himself.

Even though there was no physical change that can be seen with the naked eyes, Josh kept himself as lightning 24/7. Only turning himself to normal when he has to touch something or someone(although there aren't any people on the island).

This was his way of making sure that he doesn't get ambushed. Although it isn't a guarantee that he would never get ambushed because it is absolutely possible with seastones, doing this reduces that chance by a lot. Especially if he wanted to sleep peacefully on the island.

Josh remembered that in the anime, logias would rather stay in their normal form and only turn into their element when someone attacks them. This way they could get caught off guard and ambushed.

Josh instead kept himself as lightning and only controlled himself to be normal when he needed to be. That way, anyone who makes the mistake of trying to ambush him will pay dearly. Some of the animals had to find out the hard way.

Next he focused on the Rokushiki. Unlike his devil fruits, he got the information about all 6 moves and how to preform them directly into his brain when he got them from the system. He just needed his body to be strong enough to be able to use them.

That was the reason why Joshua trained his devil fruit powers first. This way, he can also train his body at the same time. And train he did...very rigorously.

The third and final year, he trained his Haki. His progress with Haki made him a little bit dissatisfied.

He could train his Observation Haki by blindfolding himself for the entire year, no matter what he does.

Train his Armament Haki by getting hit constantly during his Observation Haki training.

Train his Conqueror's Haki by pushing out his wills on the beasts for a whole year.

Those were all great ways to train his Haki but they had limits. He was barely able to master them by the time he needed to leave the island, even though he focused all his time on haki for the year without doing anything else and even losing sleep often.

He wanted to be able to train them to the point of being able to see a bit into the future, or not dying from a 10,000 meter fall, or projecting out his will so that it can do physical damage but he needed countless life and death battles and much more time in order to get his haki to that point.

But finally, he felt that he could take on any pirates in Paradise and he was confident that by the time he reached the New World, he would be strong enough to hold his own against most people.. short of the emperors. Let's be honest here.. 3 or 4 years of training wouldn't be realistic enough to beat a Yonko. Take them on...? Maybe, but not defeat.

He didn't do much with the system because he felt that he was already way too overpowered and didn't want to take up more time by training the powers that he could get.

Think about it... he could just do missions and kill beasts the whole time and get all sorts of powers with the system but they would be mediocre at best if Josh did not train them properly. He needed to spend a whole year on just one devil fruit in order to get used to it and master it.

So, as the time to depart from the island came, Josh decided to finally check his status and see how much he has grown since 3 years ago.

"System, show me my status!" Josh demanded, his voice was filled with confidence.

[ Status:

Name: Joshua (Josh)

Physical Strength: 100,000,000

Mental Strength: 200,000,000

(mental strength is required to use haki. The more mental strength one has, the stronger the haki)

Devil Fruit:

Rumble-Rumble(Logia); Lightning Man

Haki:

Observation Haki: Mastered

(Can sense life force and predict enemy attacks)

Armament Haki: Mastered

(Can coat entire body with Hardening)

Conqueror's Haki: Mastered

(Can tame most beasts weaker than oneself and knock out weak willed people)

Rokushiki: All: Mastered

System Points: 8,000,624]

Seeing how much he has grown, Josh felt that all of his suffering and 3 years of seclusion was well worth it. If anybody tries to mess with him, they were all going to pay, no matter how petty! That was the least he could do for himself for his 3 years of torture and self exile.