One "category" I'd love to see someone try is playing the Japanese 1.0 version, which includes the stocked-meat glitch; but, playing with no major-skip glitches. You could have four monsters who can promote whenever you like, and importantly heal (even from the dead) and change form whenever you like in later worlds. I've tried running this "category" before and would love to see someone else give it a shot, even if it's not a recognized category :)

From a hard reset on a Gameboy Player on GCN, here's one take on what the stocked-meat glitch could look like on the way to Castle Sword from the start of a new game.

1. Starting state
Redbull (D, 0:0)

2. Recruits an Albatros (C, 0:0)
Redbull (D, 0:0), Albatros (C, 0:0)

3. Recruits a Clipper (J, 0:0)
Redbull (D, 0:0), Albatros (C, 0:0), Clipper (J, 0:0)

4. Recruits an Albatros (C, 0:0)
Redbull (D, 0:0), Albatros (C, 0:0), Clipper (J, 0:0), Albatros (C, 0:0)

5. Flees battle with a Goblin (A, 0:0) on the left
Redbull (D, 0:0), Albatros (C, 0:0), Clipper (J, 0:0), Albatros (C, 0:0)

6. Clipper (J, 0:0) eats stocked meat, becomes an O-Bake (L, 1:0)
Redbull (D, 0:0), Albatros (C, 0:0), O-Bake (L, 1:0), Albatros (C, 0:0)

7. Redbull (D, 0:0) eats stocked meat, becomes a Drgonfly (K, 2:1)
Drgonfly (K, 2:1), Albatros (C, 0:0), O-Bake (L, 1:0), Albatros (C, 0:0)

8. O-Bake (L, 1:0) eats stocked meat, becomes a Werewolf (H, 3:2)
Drgonfly (K, 2:1), Albatros (C, 0:0), Werewolf (H, 3:2), Albatros (C, 0:0)

9. Albatros (C, 0:0) eats stocked meat, becomes a Hornet (K, 4:3)
Drgonfly (K, 2:1), Albatros (C, 0:0), Werewolf (H, 3:2), Hornet (K, 4:3)

10. Albatros (C, 0:0) eats stocked meat, becomes an Eagle (C, 5:4)
Drgonfly (K, 2:1), Eagle (C, 5:4), Werewolf (H, 3:2), Hornet (K, 4:3)

11. Hornet (K, 4:3) eats stocked meat, becomes a Beetle (J, 6:5)
Drgonfly (K, 2:1), Eagle (C, 5:4), Werewolf (H, 3:2), Beetle (J, 6:5)

12. Flees battle with a Zombie (F, 0:0) on the left
Drgonfly (K, 2:1), Eagle (C, 5:4), Werewolf (H, 3:2), Beetle (J, 6:5)

13. Beetle (J, 6:5) eats stocked meat, becomes an Ogre (A, 7:6)
Drgonfly (K, 2:1), Eagle (C, 5:4), Werewolf (H, 3:2), Ogre (A, 7:6)

14. Drgonfly (K, 2:1) eats stocked meat, becomes a Buruburu (L, 8:7)
Buruburu (L, 8:7), Eagle (C, 5:4), Werewolf (H, 3:2), Ogre (A, 7:6)

15. Flees battle with a Lizard (G, 0:0) on the left
Buruburu (L, 8:7), Eagle (C, 5:4), Werewolf (H, 3:2), Ogre (A, 7:6)

16. Buruburu (L, 8:7) eats stocked meat, becomes a Thunder (C, 9:8)
Thunder (C, 9:8), Eagle (C, 5:4), Werewolf (H, 3:2), Ogre (A, 7:6)

17. Ogre (A, 7:6) eats stocked meat, becomes a Dinosaur (G, A:9)
Thunder (C, 9:8), Eagle (C, 5:4), Werewolf (H, 3:2), Dinosaur (G, A:9)

18. Werewolf (H, 3:2) eats stocked meat, becomes a Warrior (B, B:A)
Thunder (C, 9:8), Eagle (C, 5:4), Warrior (B, B:A), Dinosaur (G, A:9)

19. Eagle (C, 5:4) eats stocked meat, becomes a Salamand (G, C:B)
Thunder (C, 9:8), Salamand (G, C:B), Warrior (B, B:A), Dinosaur (G, A:9)

20. Thunder (C, 9:8) eats stocked meat, becomes a Titan (A, D:C)
Titan (A, D:C), Salamand (G, C:B), Warrior (B, B:A), Dinosaur (G, A:9)

21. Dinosaur (G, A:9) eats stocked meat, becomes a Rock (C, D:C)
Titan (A, D:C), Salamand (G, C:B), Warrior (B, B:A), Rock (C, D:C)

While the Warrior has obvious use later in the game, if it gets promoted it can never again become a Warrior. So, this last step very much is dependent on whether you want to keep the Warrior alive all game, or just promote it now.

22. Warrior (B, B:A) eats stocked meat, becomes a Titan (A, D:C)
Titan (A, D:C), Salamand (G, C:B), Titan (A, D:C), Rock (C, D:C)

Cheers!

So, to use an example, let's say Gloria is an earth-type beast. She can either eat fire-type beast meat to become an air-type beast; or she can eat fire-type monster meat to become an air-type monster, then flushex back to an air-type beast. But, flushex her back to mutant, and she'll revert to water-type.

The flushex moves characters one step towards human/mutant. That is, monsters become beasts, beasts become human/mutant, robots become cyborgs, and cyborgs become human/mutant.

The flushex does not change a character's element when it transforms them from monster to beast, nor when it changes them from robot to cyborg.

However, any character that goes back to being a human/mutant (whether by using the flushex; or, by installing / eating, such as having a cyborg eat meat) will revert to their starting element. For example, Arthur becoming human (through any means) will always revert his element to fire.

Cheers :)