Reaction between bromobenzene and methyllithium to yeld toluene: possible?
MeLi certainly does lithium-halogen exchange and in the presence of MeI takes bromobenzenes to toluenes   Synth. Comm. 2001 2323

If you're asking whether the MeBr produced by the exchange can act as the methylating agent? I have never seen this reported but maybe someone else can pull up a reference.