I dont think so. Imo this hype with chansey is just wrong. Yes 500 Hp and stuff but look at her other stats. Defense is bad, worse than most mons including basics. But the real issue is the attack.. only 7 mons are worse than chansey and do u know who they are? Caterpie, sunkern, shuckle, metapod, marill, kakuna and magikarp. Even weedle has better attack than her. If ur place her in a gym the match up will be 6 attackers vs 5 defenders and a pink target dummy. To every one thinking chansey will be meta defender do ur team a favor and just drop that theory plz.
Unless ur valor or instinct.. in that case disregard everything i said and put chansey every time plz =P she will do great i promise!