Cause let's face it, the enemies in Dream Team often have more than twice the HP of their Superstar Saga counterparts, and boss strength is far higher as well. First enemy you encounter in Superstar Saga has 4 HP (Goombas in the Koopa Cruiser), first one in Dream Team has 8 HP (Grombas outside Pi'illo Island).
And Paper Mario is pretty similar. I mean, look at the bosses alone. Last boss in game one had 99 HP. Shadow Queen then had 150 HP. Super Dimentio had 200 HP. Sticker Star's Bowser had 500 HP. Their attack power went up too...
So yeah, are they getting stronger? Is it because Mario and co are also getting more powerful, with their new attacks in each game being powerful enough to basically wipe out the previous game's bestiary in a few teams apiece?
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Boring answer: I think it's just increasing to add more variety and possibilities with stats. If the first enemies had around 4 HP, it'd make sense to do about 1-2 damage, but that's not much to work with. If the first enemies had around 50 HP, it'd make sense to do about 10-25 damage.
Not as boring answer: The god known as Miyamato gradually makes everyone stronger in both offense and defense using the sacred power known as 'code' to make the never-ending battle arena more interesting.
I think they're trying to make the game's difficulty curve harder and make the level-ups and stats actually matter. in SSS last time I played the game was just insanely easy (even when I skipped almost 50 of the enemies) while in Paper Jam the level grinding in combination with Rank-up bonuses and good gear really helped lot for me.
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