One Piece is one of the most-read manga of all time. One Piece has received many praises for its storytelling, consistency, and characters. This manga has received many awards and was ranked by the critics, readers, and viewers as one of the most popular manga of all time. One Piece also set a Guinness World Record of “ the most copies published of the same comic book by the same author”.
One Piece is illustrated by Eiichiro Oda. The story follows the adventure of a young boy named Monkey D Luffy, who ate a Devil fruit unintentionally when he was 7 and because of this, his body gained properties of rubber. Thereafter he begins his journey of finding a mysterious treasure named One Piece.
Who is Crocodile in One piece?

Desert King or Sir Crocodile is the former president of the mysterious crime syndicate of Baroque Works. He is very self-confident and believes in himself. He formerly operated as “MR.O” with Nibo Robin. Nibo Robin was formerly known as “Miss All Sunday”. He is the former vice president and partner of Crocodile. Crocodile is one of the longest-running and the note-worthy adversaries in the manga. Also, as the first enemy of Luffy who defeated him completely.
He was originally introduced as a member of the seven warlords of the sea. Though he was removed from his title after attempting to take control over the Desert Kingdom Arabasta.
What’s going on between the crocodile and Ivankov?

Ivankov or Iva for short is known as the “Queen” of the Kamabakka kingdom. He is formerly said to be a prisoner of Impel Down, where he was kept in level five, but he lived in the Okama Paradise in level 5.5. After escaping the Impel Down he took part in a war named the Summit War of Marineford. After this, he returned to his post of the “Queen” of the Kamabakka Kingdom.
If we talk about how he met Crocodile, it was shown in the manga that they knew each other from the beginning. Ivankov, Luffy, and Inazuma met Crocodile when he was in his prison cell. He even found out about the weakness of Crocodiles. Ivankov used to blackmail him so that he would not be able to betray the escape party.
We also see that Ivakov has a special power of changing genders also when they are injured. Ivankov saw Crocodile changing himself as a woman, and then turning himself back to normal (when he was completely healed). Ivankov even knew the reason for the scar on Crocodile's face and his missing arm as he knew him very well since when he was an upcoming rookie.
What was Crocodiles' secret?

We see in the manga that Crocodile is blackmailed by Ivankov many times even so that he could not betray the escaping party. What do you think about Crocodile's weakness? We all know that some way or another the secret is something to do with Ivankov. In the manga, it's never shown clearly what exactly was his weakness but we can say that it was related to water or that he was a woman.
It's shown that Crocodile doten talk about his weakness related to water. But this doesn’t really seem to be a very big deal. Since carrying water around just to hit Crocodile is very inconvenient. Also, it can be the secret that Ivankov knows about Crocodile must have more to do with his defeat at the hands of Whitebeard. As the crocodile felt really humiliated and even his crew members abandoned him instead of supporting him.
Crocodile used to trust and was always very proud of his crew. But it was seen that he was very heartbroken after their reaction to his defeat. Crocodiles became distrustful and bitter.
This explains Crocodile's obsession with trust and repeatedly asking Luffy and his crew how they can trust each other so much. This defeat was witnessed by Iva and Crocodile had to beg him to save him there. This may be another weakness that Ivankov was talking about. According to you, what do you think the weakness must be? Water, the defeat, or him being a woman?