Get ACF flexible content without using ACF functions.

ACF Post Meta - Flexible Content.php

<?php

// get post ID
$pid = get_the_ID();

$flex_rows = get_post_meta( $pid, 'acf_flex_content', true );

if ( !empty($flex_rows) ) {

  foreach( $flex_rows as $count => $row ) {
    switch( $row ) {

      // if flex module one
      case 'flex_one':    
        $field_one = get_post_meta( $pid, 'acf_flex_content_' . $count . '_field_one', true );
        $field_two = get_post_meta( $pid, 'acf_flex_content_' . $count . '_field_two', true );
        include 'partials/flex-one.php';
      break;
      
      // if flex module two
      case 'flex_two';
        $field_one = get_post_meta( $pid, 'acf_flex_content_' . $count . '_field_one', true );
        $field_two = get_post_meta( $pid, 'acf_flex_content_' . $count . '_field_two', true );
        include 'partials/flex-two.php';
      break;

    }
  }

}