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

Optimization · Pure Optimization
Open-world monster collecting where team-building optimization decides everything that matters.

Optimization · Pure Optimization
A first-person puzzle game where seeing the solution is the whole skill.
Pokémon Violet leans Optimization (Pure Optimization); Portal 2 leans Optimization (Pure Optimization).
Portal 2 leans clearly harder on execution.
Pokémon Violet
Turn-based menus, traversal needs no precision
Portal 2
Portal placement requires some precision but timing is lenient.
Pokémon Violet leans clearly harder on reads.
Pokémon Violet
Only ranked human battles involve predicting switches
Portal 2
No opponent; puzzles are static.
Pokémon Violet leans clearly harder on variance.
Pokémon Violet
Encounters, IVs and catch rolls add managed randomness
Portal 2
Puzzles are deterministic with no randomness.
Portal 2 leans a little harder on optimization, though the gap is small.
Pokémon Violet
Team building and type math dominate every battle
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.