Hikari; I can see her w/ a Pottashi, and for the sake of not wanting to start anything, I will remain neutral about my decision on whether Buneary should evolve.
Brock; Happiny will evolve. Thus giving Brock something in common with Nurse Joys everywhere, giving him all the more reason to flirt (I am reminded of the episode Hassle in the Castle where Brock showed that girl that he had a Zubat as well as her). And with so much flirting going on, Croagunk'll be working overtime! Speaking of Croagunk, I think I could see it evolving possibly later in the series.
Shinji; He will definitely and eventually have Electivire and Goukuzaru. And what's this coming from, saying he's gonna get a Murkrow? Donkarasu would suit him, yes, but where's it been said that Shinji's gonna get a Murkrow???
Ash (even though he's not part of the topic); Turwig won't evolve. I've noticed a pattern with Ash's grass type starters.
Bulbasaur; evolved 0 times
Chikorita; evolved 1 time
Treecko; evolved 2 times
Now we're back at 0 times, with Turtwig. But that's just my opinion. Mukubird could very well become a Mukkuhawk, albeit much later in the series. And Buizel? Yes, Ash with a Floatzel wouldn't be too Farfetch'd (bad pun intended for your convenient torture). It escapes me, though, why Corphish never evolved. So what if Team Aqua gave it a bad image? Ash's Corphish could've evolved and do good things to try to clear the name of Crawdaunt! Again, that's just the rantings of an evolution-obsessed Pokemon Master.