Stahl only nicknamed his Alpha Machamp, 'Atlas'. The great titan in ancient myth condemned to hold up the heavens or sky for eternity. Strong, powerful, weight of the world on his shoulders and a burden that only he could bare? A perfect choice.

As a kid, Avian nicknamed all his pokemon, note he was 10 when he came up with these;
-Charizard is King Flameo because he was 3 at the time and was the coolest thing he could think of.
-Garchomp was Titania because he wanted a name that complimented her strength and resilience and the name sounded like Titanium! He did not realise that he named her after the Fae Queen of 'Midsummer Night's Dream' which is ironic cause she was terrified of fairy types.
-Weavile was Vile Edge. A tryhard edgy name for a tryhard edgy showoff. Big ol Chuuni acts the way he does because he thinks it's cool. Avian did not allow him to discover anime or sasuke uchiha lest be become WEEBvile.
Luxray was Thunders, cause even as a shinx he was self apointed lethal protector and his roar sounded like a crack of thunder.
-Leafeon, the lazy primadonna was Eva. A pretty name for a pretty thing that would rather sunbathe all day and pretend to be dead when asked to battle.
-Bibarel is Bibs. Bibs is as dumb as a pile of rocks, would lose a chess match to said pile of rocks but he is Baby.