Please find the comments inline-
1) Is there a way to connect or emulate a FlexPod connected to thge UCS Emulator?
->>You cannot use a UCS emulator in FlexPod environment. You will be required real UCS there
2) Is the FlexPod as API like the UCS XML API?
-->> FlexPod is a architecture in which UCS is used for compute purpose. FlexPod itself is just an architecture so there is no such API available as it is a combination of Cisco UCS , Nexus Switch , NetApp's storage devices. All these resources have their own API's and CLI's
3) When FlexPod is connected to the UCS can we get data of the FlexPod from the UCS XML API?
-->>To deploy FlexPod, all the resources mentioned in comment of '2' query are mandatory. Henceforth, all the communication in FlexPod is being done by the help of API's and CLI's provided by the vendors of these devices.