You will get 2x EXP part from Elecmon, Patamon is the only one who can equip this for now until he defeat Devimon so do it. Rest just battles and sidequest stuff (which is easy except Leomon)
Party
Elecmon Battle
Patamon: ATK+20 (15+5), Mega Heal, Counter, ATK UP
Leomon Battle
Agumon: ATK Break, Fury, Counter
Gabumon: ATK+35 (15x2+5), DEF Break
Patamon: MSP+20, SPD+3, ATK UP, Heal+, 2x EXP
settings before episode 13
Agumon : ATK+30 (15x2), Fury, DEF Break
Patamon: MSP+30 (20+10), SPD+3, ATK UP, Heal+, 2x EXP, Counter
Boss: Elecmon
Do similar strategy with Yukidarumon on episode 9. Use Air Shot and Wing attack once Patamon buffed.
Boss: Leomon
This battle is a bit tough when you just blindly attack (refer to my video about "The Power of Status Effect"). OK, now Grey and Garu debuff Leomon while Patamon use ATK UP to either two. It's best to buff them to Garu, Grey, Garu, and Grey each turn. Now regardless your buff or debuff, stop once Garu succeed to DEF break twice and attack with Grey and Garu's signature skills. Patamon use Heal+ when needed. There is a lol wut event in the end, causing Patamon score last hit o___o
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