First go to cydonia castle and find a spike. Second battle with spike and make his health less than 30. Then just use a starseed. If your lucky you can catch it with only 3starseed. I used 4starseed. Good luck.
lucky
74
You Can Catch Spike in Cydonia Castle and you can catch him for only 4 persent using starseeds
Where to catch a mars in monster galaxy
in spain
The spike can be found in Monster Galaxy on the planet Rock Boom. The spike can be found underground in the mine area. You may need to defeat some enemies to access it.
The song is "Roar" from Treat
You can find a jag in Pueblonia
hevenly greens step
go to zodiac island
yes
catch it with a master ball malamang seeds