When flying on an IFR flight plan in VFR weather you are expected to see an avoid just like you were bumbling along not talking to anybody.... On my flight today I was flying at 6,000. There was a decent amount of haze and smoke. About my 11 to 12 position I notice a dark spot in the near distance. He looks like he's below, the all of a sudden starts climbing like crazy. As soon as someone got off frequency I got on and said 'I have traffic 12 o'clock looks to be climbing towards me'. Controller came back 'yeah he's no facto- OH he came up there quick. Showing 5800.' 'Yeah I see him. I'm climbing and deviating to the left (he was flying towards me, still maneuvering but had moved off to my 1) to avoid and keep an eye on him' 'Deviate as necessary' was the response. It wasn't too close, but it wasn't too far away either. To be honest, I'm not sure if the other guy even saw me, he was a high wing. I also don't know whey he would be doing maneuvers like he was up around 6,000 feet (ground level is ~800msl). The controller apologized before handing me off. I told him it wasn't a big deal because of how that guy was maneuvering. And I truly meant that. So don't forget to always see and avoid!