Breloom- i'm no expert on Breloom but my set would be:
-Mach punch
-Focus punch
-Return
-spore
Simply because breloom isnt the fastest fighter ever, mach punch is useful, f.punch for pokes on the switch, return for all out dmg and spore to slow youre opponent down a bit. Bulk up is ok over f.punch or mach punch depending on ur strategy.
For slaking, if youre using a choice band, dont bother with shadow ball. Why take the trouble to use a valuable tm if your'e only planning to use hyper beam&choice band anyway, since choice band only lets you use one move. My set:H.beam,flail,f.punch,counter.
Alakazam: the set looks fine, evs in sp.attck, speed and hp,IMO.