Which game to play first Pokemon diamond or peaRL?

It's ultimately up to personal preference which game you choose to play first. Many players start with the version that has their preferred box legend:

- Pokemon Diamond features Dialga, a steel/dragon type Pokemon, representing time.

- Pokemon Pearl features Palkia, a water/dragon type Pokemon, representing space.

While both games offer similar experiences, here are a few key differences between them:

Exclusive Pokemon:

* Pokemon Diamond: Stunky, Glameow, Drifloon, Murkrow, Misdreavus,

Sneasel, Scyther, Heracross, Skarmory, Houndoom

* Pokemon Pearl: Budew, Roselia, Roserade, Cranidos, Shieldon,

Bonsly, Mime Jr., Weavile, Murkrow, Misdreavus, Gligar, Elekid

Legendary Pokemon:

* Pokemon Diamond: Dialga

* Pokemon Pearl: Palkia

Other Differences:

- Some minor differences in dialogue, character design and storyline events.

- Slightly Different availability of TMs and Hidden Moves

Overall, both games provide compelling experiences and ultimately, the choice between Pokémon Diamond and Pokémon Pearl is a matter of preference.