gameguru01

Ok I haven't played it for a few years so I have forgot most of the city names

To get mondo and sasuke

First off when you get to the town at the top of the mountain ( sorry forgot the name)
After you speek to the leade make sure you choose KAZUMI for your party
Keep kazumi in your party and exit the city then go to the hidden village ( forgot again sorry ) you will be caught by sasuke and you will see the elder after a short talk with the elder mondo will join your party exit the building and go towards the exit of the town along the way you will see sasuke after talking with him he will join you.

To get mukumuku there are to ways to get him

1st
After you leave jowy when you first get to your home town all you have to do is instead of going into your house go to the right of your house to the big tree and keep pressing the X button you will walk around the tree after the 3rd time mukumuku will be behind you and he wil join your party

2nd
Make sure your alone ( nobody in party )
At world map makesure your outside of greenhill and follow the path towards greenhill muse boarder keep doing this until he shows up in battle