Yeah. Shuckle and Munchlax's Speed stats are the lowest. For whatever reason, I see Munchlax and Snorlax being somewhat fast if, say, there's food involved. I agree with Shuckle, though. I can't see that guy moving for anything. Same with Slowpoke, Slakoth and Magcargo. I mean, that thing is a slug for goodness sakes.
For whatever reason, I always imagined Blastoise as slow. I know it isn't that bad stat-wise. I think it's because of that huge, bulky shell. I just can't imagine it moving easily and swiftly. Meh.
I also think that Slaking is weird. It evolves from Slakoth, has the ability Truant, is called "the lazy Pokemon," and is depicted in all game sprites on the ground being, well, lazy. Yet it has a base speed of 100. I just can't see it moving tha fast. Maybe it's just me.