sorry for the necro, thought I'd help a bit.
get the latest dolphin install (developement version, not stable version) here :
https://dolphin-emu.org/download/?ref=btn
seems like you don't understant some concepts :
- you laptop bt adapter probably isn't compatible with dolphin bt passtrough
https://wiki.dolphin-emu.org/index.php?title=Bluetooth_Passthrough#Adapter_test_results
- you get you bt activation icon in the windows task bar when the automatic windows bt driver in sinstalled for you bt adapter.
- to work 100% right, motion plus requires that you use bt passthrough mode, in this mode you can only sync and reset wiimotes (in dolphin controller config) when a game is running, why ? because :
- bt passthrough mode means dolphin is acting like a wii and emulating the bt stack to you bt adapter (so obviously when a game is running/emulated), which means windows drivers can't be used for this and are conflicting.
get the latest zadig
http://zadig.akeo.ie/ get the latest
https://github.com/daynix/UsbDk/releases (x64 version if you're on win10 64bits) and install the usbdk drivers, reboot and run zadig as administrator.
choose to replace the driver for your bt adapter with libusbK
also on the left, there is a usb ID in 2 blocks, one is VID (left block) and one is PID (right block), copy and paste them somewhere.
now go to : C:\Users\YourUserName\Documents\Dolphin Emulator\Config\ and open Dolphin.ini in notepad++ or notepad
there should be bt passthrough line, we're going to for the use it to for the use of your adapter :
you VID and PID is un hexadecimal, dolphin expect the value in decimal for some reason, so use this to convert the hexadecimal values you have for VID and PID
https://www.rapidtables.com/convert/number/hex-to-decimal.html
now you want you dolphin ini file to look like this in the bt passthrough part :
where xxxx are the DECIMAL value you just converted
[BluetoothPassthrough]
Enabled = True
VID = xxxx
PID = xxxx
(PID is 3 digits on mine for example, though)
save the ini file.
now, run the latest dolphin build, make sure bt passthrough is on in the controller config. close it.
run a game.
there should be a black screen (maybe for a couple sec) but the game should run after that.
open the controller config again and clic on reset then on sync and press the red sync button on your wiimote. (do this for like a minute just in case the wiimote has trouble connecting)
if this doesn't work. (it never work for me

but this is what dolphin wiki wanted you to do
https://wiki.dolphin-emu.org/index.php?title=Bluetooth_Passthrough)
close dolphin.
make sure the dolphin.ini still has the right values for you adapter.
go back to zadig and replace the diver for your bt adapter with WinUSB (mine is winusb 6.1.7600.16385)
this is the only way this whole thing worked with bt passthrough on my end.