Cobblemon evolution lines
Every evolution family in Cobblemon and exactly what triggers each stage: a level, an evolution stone, high friendship, a held item, a trade, or a specific time of day. 327 families listed.
How evolution works in Cobblemon
Most species evolve by reaching a level. The rest need something specific, and that is where people get stuck. The common triggers are an evolution stone you mine as ore, high friendship built by walking and levelling together, a held item, a Link Cable to simulate a trade, or a particular time of day.
Note that servers can gate evolutions behind level caps, so a Pokemon that has stopped levelling has probably hit a cap rather than a bug. See gyms and level caps.