bug
You Can Use Vespiquen Which Evolves From A Female Combee And Level 23
There mainly in Eterna forest.
in Pokemon diamond they are -aaron - bug type - bertha - ground type - flint - fire type - lucian - psychic type
In Pokemon Diamond, Yanma is a bug and flying type of Pokemon. It evolves if you level it up while it knows ancient power.
Fire types are good against Steel,Ice,Bug,and Grass Pokemon.
Kricketot is a Bug type pokemon.
Flying And rock
u have u know with a bug type then then get an egg and hatched it tada
fighting types and bug types are the most effective types on dark.
Heracross is a bug type Pokemon that your friend in Pokemon diamond/pearl has and uses. He is rather weak but with the proper training he'll be a great assett to your Pokemon party
You can find him and more rare bug type Pokemon on route 229 next to Resort Area after you get National Dex.