Oh yeah, the Poketch is one of my favourite game features ever. I really liked it for the reasons you mentioned - keeping track of steps when egg hatching (I really like knowing how long it took for my eggs to hatch), EV tracking (nice to be able to see the number right there instead of having to keep track of PP or something), roaming legends (SO NICE being able to just look at the bottom screen to see where they are) - plus several other reasons (e.g. drawing using the memo pad or dot artist apps).For me, it had to be the Pokétch. It was the most convenient feature of Gen IV because it allowed me to keep track of approximate steps required to hatch Eggs, keep track of EVs when EV training and the roaming legendaries.