With Jaime having his mind linked to Khaji Da, the scarab can transmit thoughts and other useful knowledge to him in battle to help him out. Khaji Da can also help Jaime with things outside of just fighting, though, namely being able to translate different alien languages. Given that Khaji Da comes from an alien race known as The Reach, it's no surprise that it knows a seemingly endless number of languages from across the galaxy.
Jaime is already a pretty smart guy, but Khaji Da opens him up to a whole new world of language and really makes him an intellectually strong character. Jaime having tons of alien languages under his belt makes his own encounters with non-Earth allies and enemies much easier. Plus, any big hero team he's a part of now has its own interstellar translator. Blue Beetle might mostly be an Earthbound hero, but Khaji Da makes him capable of communicating with the wider galaxy.
