The one's I agree with would be Remoraid and possibly HootHoot, but the rest are such lovely Pokemon that are pretty well remembered, especially Brock's Sudowoodo
But Sudowoodo is an imitation of a tree. Not a Trevanant. You should also advertise how fun Colosseum was and how these Pokemon appeared in Gen 4. They just aren't Pokemon with good stats or aren't evolved so they aren't used.