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EeveeDream
Some venue-specific notes for lower venues:
Training Fields: Level 12 and up (STR 60) can one-shot scratch everything. Level 9 (STR 47) will one-shot everything but the Leafy Moth, which takes 2.
Woodland Path: Level 12 will two-scratch everything (except the weaker holdovers from Training Fields, which only need 1.)
Level 9 will need 3 scratches for the stronger enemies: Autumn Dryad, Basilisk, Cockatrice, Clown Chager, Coral Basilisk, and the Painted Marionette during NotN.
Level 25s will one-shot everything but those stronger enemies, which will need 2.
Scorched Forest: Level 12 will need 3 scratches for all but the weakest.
Level 25 will 2-scratch everything.
Condensed version:
FIELDS: level 9 (STR 47) to one-scratch all but Leafy Moth; Level 12 (STR 60) to one-scratch everything.
PATH: Level 12 to two-scratch all; level 9 needs 3 for the toughest.
FOREST: Level 12 to three-scratch everything but the weakest; 2 for those.
I recommend Level 12 as a good low-end farming goal - buying a couple of level 12 dragons, or paying someone to level up a pair, is within most people's range. That will allow farming of the 3 lower levels for festivals, including the Scorched Forest which is best for festival currency for many of them.
If they never go beyond that, they'll gradually earn XP up to level 13 (I think? Not sure where the cap is on Scorched Forest), and can comfortably farm during festivals and ignore the coliseum the rest of the time.