First of all you need to buy the two books, the shopkeeper has one of the books.
The fluffy girl has the another book.
The one with this icon:






(the easiest way to do this is with the dealer/devil offering you max health or buying the pastries to the bunny girl) so you are going to need a bit of luck, and I also forgot to take screenshots of it and I may talk a bit of missinformation because I also forgot the obtaining of the second book ᕕ(ᐛ)ᕗ

In the books you will find the clues where the parts are.

book one

Spoiler

If you didn't understand: one part is at the beginning of the first level, and the another is on the right side of the second boss room

first part of the robot
For the first part of the robot you first need to beat the first boss/magnolia, then backtrack to the starting room and shoot the center of the ceiling


pick up the head and the flare gun (optional) later I'll explain why you need the flare gun

the second part of the robot

Go to the second stage, pick up the weapon from the chest (if the weapon is good enough) and defeat the second boss/ tank twins, on the right side of the boss room, try to jump on the other side of the hole, you can accomplish that by "rocket jumping" with the flare gun (aim and shoot at your feet) or jumping at the edge of the hole also works but a bit risky, then shoot at the right wall, this will make a hole and reveal the secret room


PS: Its seems that any and only explosive weapon can break the wall

steal the leg of the robot and continue to the next floor, oh and by the way you don't need the gasoline, the gasoline is to fight against a "secret boss"/unlockable character on the third floor

why this is the hard part?
The third and fourth floor are the hardest part about trying to unlock moko, this is because you need both robot parts at the same time, (otherwise if you only bring one robot part the destroyed robot on the last floor wil be reset) so your only weapon is the melee and also it’s also a bit of luck dependant, because of the chest room to help you with a random weapon.

Combat tips:
I suggest to play very calm and not so aggresive and also buy the damage upgrades from the shopkeeper, if you want to play safe and if you recieved damage buy the milk and once you defeat the third boss don’t forget the robot part you dropped; same thing for the last floor

Fixing the robot:
they’re different pics because the gif is very big for the guide




once you fully fix the robot, you unlocked it, yay! (ﾉ◕ヮ◕)ﾉ, now that only is left is die to the final boss or defeat it

This is the first time I make a guide on steam so it’s not perfect and my english isn’t the best.
I hope you liked this guide and find it useful