Bluetooth connection
why it is not possible to pair iPhone 12 pro MAX with iPad pro 11 ichi 3rd generation similar how is it possible to pair iPhone with Smart watch?
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What, specifically, are you attempting to achieve by pairing an iPhone and iPad over a Bluetooth connection? Drawing parallels with an Apple Watch makes little sense.
Whilst it is technically possible to do so, for the majority of applications, Bluetooth pairing of an iPad and iPhone is entirely pointless as both iPad and iPhone can access the same network resources - and, for the most part, can use the same Apps.
If your intention is to use Cellular Hotspot features of your iPhone, this link is optimally achieved at much higher bandwidth using the native WiFi hotspot connection - this being a largely automated process. Hotspot connections over WiFi offer substantially greater throughput, range and reliability.
How to set up a Personal Hotspot on your iPhone or iPad – Apple Support
If you still wish to pair your iPad and iPhone over Bluetooth, you first need to manually enable the hotspot feature on your iPhone:
Settings > Mobile Data > Personal Hotspot > Allow Others to Join - set to ON
Next, Bluetooth for both the iPad and iPhone must be placed in Discovery mode:
Settings > Bluetooth (accessing this page will automatically place the device in Discovery mode)
Whilst both iPad and iPhone are in Discovery mode, you can mutually pair the devices.
Again, I must stress, unless you have an unusual “edge case”, pairing of iPad and iPhone over Bluetooth is largely pointless.