Diglett evolves at level 26. It's best to try to have a Diglett battle an electric type Pokemon; since electric moves have no effect on ground types. Don't train a Diglett against a flying type Pokemon; ground moves don't affect flying types. You can also get a Dugtrio in the Diglett Cave (can be gone into outside of Vermillion City); any Dugtrio will be around level 30-33.
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Dugtrio.
No, the pokedex can be confusing sometimes with pokemon not in the same evolution chain showing up on the same page.
Diglett evolves at Level 26.
Diglett evolves into Dugtrio at level 26.
Lv 26