Monster Rancher 2: Beating the game with your first monster

Beginner's guide on how to beat the game with your first monster Special thanks to KurasuSoratobu's guide that taught me about this game:
Intro (0:00) Baby stage (0:52) Baby training routine (3:04) Errantry (3:18) Battles (7:44) Tech chain (9:36) Adolescent stage (10:40) Adolescent training routine (14:12) Expedition (15:39) Making money (18:09) Adult stage (18:51) Adult training routine (20:46) Old age (20:56) Getting Gold Peach (21:57) S-class (23:07) Ending (24:59)