On both cart tracks, a Carkol will run down the tracks from the Route 3 end towards the Route 4 end. If the player approaches from either Route 3 entrance, the Carkol will spawn when the player nears the tracks; from the Route 4 entrance, they will spawn after the player has walked up the tracks a ways. They can spawn again once the player leaves the area.
A Woobat flies around the bridge that lies between the cart tracks. While several Woobat can be seen flying underneath the bridge, only one of the Woobat flies above the bridge, which is the only one that can be encountered. It respawns when the player leaves the area.