head to head
Neither is simply harder - they are hard in different places. Pokémon White Version 2 demands more reads; The Elder Scrolls V: Skyrim demands more execution.

Optimization · Pure Optimization
Team-building and type-matchup optimization, with RNG layers and optional human prediction online.

Optimization · Pure Optimization
An open-world RPG mostly about discovering and stacking exploitable progression systems.
Pokémon White Version 2 leans Optimization (Pure Optimization); The Elder Scrolls V: Skyrim leans Optimization (Pure Optimization).
The Elder Scrolls V: Skyrim leans clearly harder on execution.
Pokémon White Version 2
Turn-based menus remove any physical ceiling
The Elder Scrolls V: Skyrim
Combat is forgiving; aim and timing rarely punish you.
Pokémon White Version 2 leans clearly harder on reads.
Pokémon White Version 2
Optional human PvP adds prediction; campaign AI is scripted
The Elder Scrolls V: Skyrim
Enemy AI is scripted and exploitable; not adaptive.
Pokémon White Version 2 leans clearly harder on variance.
Pokémon White Version 2
Encounter rolls, catches and damage ranges shape runs
The Elder Scrolls V: Skyrim
Loot tables and leveled lists inject mild randomness.
Pokémon White Version 2 leans a little harder on optimization, though the gap is small.
Pokémon White Version 2
Type matchups, EV training and team building are solvable math
The Elder Scrolls V: Skyrim
Skill stacking, enchant loops, and exploits are deeply solvable.
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.