head to head
Neither is simply harder - they are hard in different places. Pokemon FireRed Version demands more variance; Portal 2 demands more execution.

Optimization · Pure Optimization
The Game Boy Advance remake of the original Kanto journey with modern mechanics and the Sevii Islands.

Optimization · Pure Optimization
A first-person puzzle game where seeing the solution is the whole skill.
Pokemon FireRed Version leans Optimization (Pure Optimization); Portal 2 leans Optimization (Pure Optimization).
Portal 2 leans clearly harder on execution.
Pokemon FireRed Version
Turn-based menus only
Portal 2
Portal placement requires some precision but timing is lenient.
Pokemon FireRed Version leans clearly harder on reads.
Pokemon FireRed Version
AI trainers follow fixed logic; PvP optional
Portal 2
No opponent; puzzles are static.
Pokemon FireRed Version leans clearly harder on variance.
Pokemon FireRed Version
Wild encounters and catch rolls bring luck
Portal 2
Puzzles are deterministic with no randomness.
Portal 2 leans a little harder on optimization, though the gap is small.
Pokemon FireRed Version
Team composition and matchup knowledge decide everything
Portal 2
Solving the puzzle's logic IS the entire game.
A matching score does not mean a matching test. Two games can both sit at 10 on execution and demand completely different things of you - which is why the reasoning above matters more than the number beside it.