How do you get a mechan o' wyrm in dragon quest monsters?

To obtain a Mechan o' Wyrm in Dragon Quest Monsters, you need to breed a Mechan o' Wyrm with a suitable monster that has the right traits. Specifically, you can use a Mechan o' Wyrm coupled with a monster like a Metal Slime or another dragon-type monster. Make sure to check the breeding combinations and requirements in the game's breeding menu to ensure success. Remember, luck plays a role in the breeding process, so you may need to try multiple times.