For incidental release at ixicarbon.com, 2024-06-01.

Van Halen - Poundcake (intro) 
tab by InHiding 
(standard tuning)

Never seen the harmonics tabbed or played even close to what's on the album. Hope this is better. 
Not sure about the open strings with all the strummed riffs, play what feels good

Riff1 part A (easy mode: omit the second slide)

|---0-0-0-0-0---0-0-0---0-0----0-0-0----0-0---|
|---0-0-0-0-0---0-0-0---0-0----0-0-0----5-5---|
|---9-9-9-9-9---9-9-9\7-7-7----7-7-7\6--6-6---|
|---9-9-9-9-9---9-9-9\7-7-7----7-7-7\---7-7---|
|---7-7-7-7-7---7-7-7\5-5-5----5-5-5\4--------|
|-----------0---------------------------------|


Riff1 part B  (everything alt picked except the 2nd and 3rd note are both upstrokes, emphasized in tab)

         u   u                          
|---<5>-<5>-----------------------------<5>-----------|
|---<5>-----<5>-<5>-<5>-<7>-<7>-<5>-<5>-----<7>-<5>---|
|-----------------------------------------------------|
|-----------------------------------------------------|
|-----------------------------------------------------|
|-----------------------------------------------------|


Repeat Riff1 part A


Riff1 part C

   |--light P.M.---|
|----------------------------------<5>-<5>-<5>----------|
|---------------------<5>-<5>-<5>-----------------------|
|-------------------------------------------------x-x---|
|---------<5>-------------------------------------x-x---|
|---<4>-------<3.2>-------------------------------x-x---|
|-------------------------------------------------------|
  


Riff1 part D

|---0-0-0-0-0---0--0--0--0--0----- 0--0--0--0-0------|----------------------|
|---0-0-0-0-0---10-10-10-8--8------8--8--8--5-5------|----------------------|
|---9-9-9-9-9---11-11-11-9--9------9--9--9--6-6------|----------------------|
|---9-9-9-9-9---12-12-12-10-10-----10-10-10-7-7------|---2-----2----2-------|
|---7-7-7-7-7----------------------------------------|---0-----0----0-------|
|-----------0----------------------------------------|-----3------3----3~---|
                                                                       ?

<>   natural harmonic
x    percussive mute
u    upstroke
P.M. palm mute