Eddie is not at the end, so, Eddie must be in the middle of one of the rows.
Dalton is second to the left of Fantom i.e. Dalton, ___, Fantom
Charlie is the neighbor of Eddie and is standing diagonally opposite to Dalton.
B-dawg is the neighbor of Fantom.
So, the arrangement is -
Dalton | B-dawg | Fantom |
Abby | Eddie | Charlie |
Original neighbors of Eddie are Abby and Charlie.
So, on interchanging place with Eddie, the new neighbors of Dalton will be Abby and Charlie.