Even if you run Max Hp and Max Sp Def Ivysaur will get 60 / 103 / 145 Defenses. Venusaur is better overall defensively because of Leftovers but if you want to use Ivysaur he could make a decent switch in to bulky Water types.. maybe. Its still going to be slower than most things. Either go fully defensive or if you want Speed use Venusaur. No speed Chlorophyll Ivysaur will outrun Jolly Lucario, most Zapdos / Jirachi and Adamant Salamence. It hits 312 speed so
here you can see what it will outrun.
How do I know this?, because before I became the luckiest player on Serebii I was a noob that asked BH about whether or not I should use a Evolite set.
Except Turtwig was complete crap, it and its evolutions weren't even cute or a badass.